The oxidation of organic substances with compounds of trivalent manganese: XVIII. A contribution to the coulometric generation of manganese(III) acetate in an acetic acid medium

Conditions were found under which manganese(III) acetate can be electrochemically generated at a platinum anode with 100% current efficiency. It was found that even traces of

5. Time Dependence of the Consumption of the Oxidizing Reagent in the Indirect Determination of Hydroquinone with Coulometric Generated Manganese(III) Acetate

     

2.

Spectrophotometric determination of sulfite with soluble mercury(II) compounds     

Ray E. Humphrey  George S. Ingram  Druce K. Crump 《Microchemical Journal》1982,27(3):351-356

Sulfite ion reacts with mercury(II) ion in acid solution to form the mercury(I) ion. The reaction is rapid and quantitative. The mercury(I) ion absorbs at 237 nm with a molar

5. Beer's law Data for Sulfite Complexes of Covalent Mercury(II) Compounds

Time (min)	0	5	10	30	60
Consumption of Mn(III) (mol/mol)	2.00	1.99	2.00	2.01	2.00

SO2 (ppm)	?HgCl2a	?HgBr2	?Hg(Ac)2b	?Hg(SCN)2
2.0	12,500	10,000	10,000	9,200
4.0	12,500	11,500	10,000	9,000
6.0	12,500	11,500	10,000	9,200
8.0	12,000	11,000	10,500	9,800

a

Molar absorptivity based on sulfite ion at 230 nm. Solution was 6.86 buffer.

b

Mercuric acetate solutions seemed to be somewhat unstable. absorptivity of about 25,000. The absorbance is linear over a range of approximately 0.5–5.0 ppm as SO₂. Covalent mercury(II) compounds form a complex with sulfite, Hg(SO₃)₂^2?, which absorbs at 230 nm and shows a linear response over a range of 1–8 ppm as SO₂.

     

Spectrophotometric determination of sulfite with soluble mercury(II) compounds

Sulfite ion reacts with mercury(II) ion in acid solution to form the mercury(I) ion. The reaction is rapid and quantitative. The mercury(I) ion absorbs at 237 nm with a molar

5. Beer's law Data for Sulfite Complexes of Covalent Mercury(II) Compounds

Spectrofluorimetric determination of thallium in silicate rocks with rhodamine b in the presence of aluminum chloride

A sensitive spectrofluorimetric procedure with rhodamine B in the presence of aluminum chloride is given for determining submicrogram and microgram quantities of thallium in silicate rocks. Samples are decomposed with a mixture of hydrofluoric and nitric acids and then treated with hydrochloric acid. Thallium is extracted as its dithizonate with chloroform from an alkaline medium containing ascorbate, citrate, and cyanide and then back-extracted with dilute nitric acid. After destruction of the organic matter and treatment with bromine, hydrochloric acid, aluminum chloride, and rhodamine B, the

T001. Determination of thallium in U.S. Geological Survey standard rocks by different laboratories

Thallium (p.p.m.)		Method	Ref.
G-1	W-1
1.06	0.102	Neutron activation analysis	1
1.08	0.121, 0.116	Neutron activation analysis	2
1.3	0.17	Neutron activation analysis	3
1.3	0.11	Spectrographic	4
	0.105–0.110	Flameless atomic absorption spectroscopy	5
1.3a	0.13a		19
1.24b	0.110b		20
1.09 ± 0.01	0.110 ± 0.005	Spectrofluorimetric	Present method

a

Values given by Fleischer.

b

Average value given by Flanagan. fluorescence intensity of the benzene-extracted rhodamine B chlorothallate is measured. The limit of determination is approximately 0.01 p.p.m. for a 1.0-g sample. The thallium contents of U.S. Geological Survey standard rocks G-1 and W-1 were found to be 1.09 ± 0.01 and 0.110 ± 0.005 p.p.m., respectively.

     

Microdetermination of total sulfur and inorganic sulfate in biological materials

A simple, rapid, and accurate method for determination of total sulfur and inorganic sulfate in biological materials by barium chloranilate colorimetry is presented. Criteria required

3. Precision of S Determination, Whole Blood, Blood Plasma, TCA Extracts, and Urine

     

5.

A new kinetic method for the determination of magnesium and its application to natural waters     

M. Ternero  F. Pino  D.Pérez Bendito  M. Valcárcel 《Microchemical Journal》1980,25(1):102-110

A kinetic method is described for the determination of trace amounts of magnesium in the presence of calcium. The procedure is based on the inhibition of the manganese(II) catalyzed aerial oxidation of 1,4-dihydroxyphthalimide dithiosemicarbazone reaction by

2. Effect of Transition Metals^a

Sample	Determinations	Mean (μg)	SD (μg)
Whole blood	10	1004	21
Blood plasma	10	543	4
TCA extracts	10	24	2
Urine (totals)	10	598	31
Urine (inorganic S)	10	374.4	19

Transition metal	Concentration (M)	Percentage inhibition	Mg(II) found (×l05M)
Fe(II)	3.6.10?5	54.1	4.62
Fe(III)	3.6.10?5	47.8	4.48
Co(II)	3.4.10?5	50.0	4.53
Ni(II)	3.4.10?5	50.0	4.53
Cu(II)	3.1.10?5	52.0	4.56
Zn(II)	3.0.10?5	54.1	4.62
Cd(II)	1.7.10?5	52.0	4.56
Hg(II)	9.9.10?6	45.8	4.44
Sn(II)	2.1.10?6	50.0	4.52
Pb(II)	1.2.10?6	54.1	4.62

a

Conditions: 4.53.10^?5M Mg(II), 35 ng Mn ml^?1, 0.429 M ammonia, 1.6.10^?4M OH-PDT.

3. Determination of Magnesium in Natural Waters

			Mg(II) found (M)b
Natural water	Ca(II) presenta		Atomic absorption
sample	M	Kinetic absorption	method
Commercial	3.45 · 10?4	1.65 · 10?3	1.74 · 10?3
Commercial	5.46 · 10?4	1.57 · 10?4	1.81 · 10?4
Untreated	6.13 · 10?4	2.16 · 10?4	2.40 · 10?4
Treated	4.95 · 10?4	1.93 · 10?4	2.17 · 10?4

a

EDTA titration less the magnesium.

b

Average of three separate determinations. traces of magnesium(II). The reaction is followed spectrophotometrically by measuring the rate of change in absorbance at 594 nm. The calibration graph (percentage inhibition vs magnesium concentration) is linear in the range 329–535 · 10^?5M with an accuracy and precision of 1.2%. The method has been applied to the determination of magnesium in natural waters at low concentrations.

     

A new kinetic method for the determination of magnesium and its application to natural waters

A kinetic method is described for the determination of trace amounts of magnesium in the presence of calcium. The procedure is based on the inhibition of the manganese(II) catalyzed aerial oxidation of 1,4-dihydroxyphthalimide dithiosemicarbazone reaction by

2. Effect of Transition Metals^a

Ion flotation of cadmium using ethylhexadecyldimethylammonium bromide

Cadmium ions react with the collector, ethylhexadecyldimethylammonium bromide (EHDABr), to form a surface-active sublate which can be removed from aqueous bromide

a. Effect of Foreign Metal Ions on the Flotation of Cadmium^a

Foreign ion	Foreign ion concentration (M) (×10?5)	Foreign ion removed (%)	Cadmium removed (%)
None			99.21
Zn2+	6.11	0.06	98.41
Cu2+	6.29	3.64	97.80
Pb2+	3.86	4.80	91.78
Cr6+	7.69	30.75	99.07 solutions by ion flotation. A typical ion flotation procedure involves passing air through a 250-ml solution containing 5 ppm Cd2+, 0.05 M Br?1, and 1.7 × l0?3M EHDABr at a flow rate of 40 ml/min for 1 hr. The procedure was simple and efficient. Chromium, copper, and zinc ions do not interfere under the experimental conditions.

a

Cd²⁺, 4.46 × 10^?5M; EHDABr, 4.25 × 10^?4; Br^?, 5 × 10^?2M; flow rate, 40 ml/min; time, 60 min.

     

Spectrophotometric studies of neomycin-copper complex and determination of neomycin sulfate using an auxiliary ligand

Spectrophotometric investigation of the deep blue colored, water-soluble complex of

1. Stability constant and free energy of formation of Cu-NMS complex at 30 ± 1 °C

     

8.

Analysis of nitrate-perchlorate mixtures by difference spectrophotometry     

Salah Shahine  Soad Khamis 《Microchemical Journal》1979,24(4):439-443

Nitron and tetraphenylarsonium chloride react with a cobaltous salt in the presence of thiocyanate to form blue ion-association complexes, which can be extracted with organic solvents. This fact has been made the basis for the analysis of mixtures of nitrate and perchlorate by difference spectrophotometry. An aliquot of the sample solution is treated with a known excess of tetraphenylarsonium chloride to precipitate perchlorate only. After separating off the precipitate, the excess of reagent is determined in the supernatant liquid as tetraphenylarsonium cobaltothiocyanate and the perchlorate content can be found from a calibration curve. Another aliquot is treated with an excess of nitron to precipitate both anions; the excess of nitron is then determined as nitron

2. Analysis of Nitrate-Perchlorate Mixtures

Method	$\text{log}\text{K}{}_{\mathrm{s}}$	ΔF (Kcal/mole)
Mukherji and Dey (4)	4.11	?5.70
Subhrana and Raghavrao (6)	4.80	?6.66

     

9.

Polarographic determination of antimony in leadantimony alloys     

H.F. Hourigan  J.W. Robinson 《Analytica chimica acta》1954

A polarographic method for the determination of antimony in lead-antimony alloys has been developed. It was found that the interference due to the presence of varying concentrations of lead and hydrochloric acid would be eliminated by the addition of potassium chloride.

t001. The method gave satisfactory results within the range:

Perchlorate			Nitrate
Taken (μg)	Found (μg)	Error (%)	Taken (μg)	Found (μg)	Error (%)
400	404	+ 1.00	248	250	+0.81
400	400	0.00	496	492	?0.81
400	400	0.00	992	992	0.00
800	796	?0.50	248	248	0.00
600	602	+0.33	248	245	?1.21
800	792	?1.25	496	498	+0.40

     

10.

Luminol-dependent chemiluminescence analysis of cellular and humoral defects of phagocytosis using a chem-glo photometer     

Knox Van Dyke  Michael Trush  Mark Wilson  Patricia Stealey  Philip Miles 《Microchemical Journal》1977,22(4):463-474

In summary, this report describes the conditions under which luminol has been utilized to measure phagocytosis-associated metabolic events in activated human PMNs and rabbit and dog alveolar macrophages. We feel that this system may have wide applicability to both clinical and experimental situations. Some possible applications are shown in the following table.

Potential Applications of Luminol-Amplified Chemiluminescence

Hydrochloric acid	4 — 8M
Lead	0 — 0.03M
Antimony	0 — 0.002M

     

11.

Determination of acidic dissociation constants of several vic-dioximes     

Charles V. Banks  Anton B. Carlson 《Analytica chimica acta》1952

The acidic dissociation constants of three vic-dioximes have been determined from spectrophotometric data. The results may be summarized as follows:

Cell type	Applications
Human polymorphonuclear leukocytes	(1) Detection of bactericidal defects, particularly chronic granulomatous disease
	(2) Detection of host opsonic defects (both immunoglobulin and complement ?C3b opsonic defects).
	(3) Analysis of drug effects on host cellular and opsonic defenses (9,11).
	(4) Characterization of bacteria or other particulate matter in terms of ability to generate opsonic activity and/or be ingested by phagocytic cells (3,7).
Alveolar macrophages	(1) Detection of environmental pollutant effects on respiratory defense mechanisms (against both particulate and soluble matter).
	(2) Analysis of drug effects on respiratory defense mechanisms, particularly drugs administered in the treatment of respiratory diseases.

     

12.

Amperometric titration of copper in brass     

Theodore R. Williams  Frederick G. Burton 《Analytica chimica acta》1962

A direct amperometric titration of copper is described; o-(p-tolylsulfonamido) aniline serves as titrant. The optimum conditions are discussed and the method is applied to the analysis of copper in brass alloys.

t001. IV. Analysis of various samples in which copper was determined (Values given as percentages)

pK1	pK2
2,3-butanedionedioxime	10.6 ± 0.1	11.9 ± 0.3
1,2-cyclohexanedionedioxime	10.6 ± 0.2	12.4 ± 0.5
1,2-cycloheptanedionedioxime	10.7 ± 0.2	12.3 ± 0.5

     

13.

The vibrational ground state rotational spectroscopic constants and structure of the HCN dimer     

L.W. Buxton  E.J. Campbell  W.H. Flygare 《Chemical physics》1981,56(3):399-406

Rotational spectra have been assigned for four isotopic species of the linear HCN dimer in the vibrational ground state. The spectroscopic constants are

Constituents	Thorn Smith # 30	Thorn Smith # 54	NBS # 37E	NBS # 63C
Cu present	59.30	84.04	69.61	80.48
Zn	37.81	1.452	27.85	0.093
Pb	0.1	8.590	1.00	9.35
Sn	Trace	5.737	1.00	9.03
Sb				0.52
Ni	Trace		0.53	0.32
P				0.145
S				0.060
As				0.023
Fe	1.22		0.004	0.0013
Al	1.15
Mn	0.35
Cu found	59.09	83.64	69.68a	80.54a	aAverage of 3 determinations.

     

14.

Potentiometric study of silver(I)-thiosemicarbazonates     

M.Argüeso Jiménez  M.D.Luque de Castro  M. Valcárcel 《Microchemical Journal》1980,25(3):301-308

A potentiometric method is described for the determination of thiosemicarbazones involving the formation of a complex with Ag(I). This method is proposed for thiosemicarbazones of the following carbonyl compounds: salicylaldehyde, p-hydroxybenzaldehyde, benzaldehyde, picolinaldehyde, 6-methylpicolinaldehyde and p-dimethylaminebenzaldehyde. Stability constants of the complexes are determined by Ringbom and Harju's method.

FIG. 2. Variation of pAg + logα_{PAT (H)} + log ([Ag?PAT)]/[PAT])

2. Formation Constants of the Silver-Thiosemicarbazonates

isotope	-B0 (MHz)	DJ (kHz)	xN1 (MHz)	xN2 (MHz)
HC14N-HC14N	1745.80973(50)	2.133(30)	?4.0973(200)	?4.4400(190)
HC14N-HC15N	1700.30190(30)	1.939(40)	?4.1059(10)	-
HC15N-HC14N	1729.92082(20)	2.023(30)	-	?4.4339(6)
HC15N-HC15N	1684.28825(25)	1.900(30)	-	-

     

15.

Sur la thermogravimétrie des précipités analytiques : Dosage du gallium     

Thérése Dupuis  Clḿent Duval 《Analytica chimica acta》1949

With the help of the Chcvcnard thcrmobalancc the authors have determined the minimum temperatures necessary for quantitatively converting the derivatives of gallium into oxide Ga₂0₃.

Thiosemicarbazone	Log $\text{K}{}_{\mathrm{<mtext>f</mtext>}}$
-Benzaldehyde	15.5 ± 0.1
-Picolinaldehyde	14.0 ± 0.
-6-Methylpicolinaldehyde	14.5 ± 0.
-Salicylaldehyde	15.7 ± 0.1
-p-Hydroxybenzaldehyde	15.6 ± 0.
-p-Dimethylaminebenzaldehyde	17.2 ± 0.1

     

16.

Solvent extraction studies of cobalt in aqueous thiocyanate solutions using Aliquat-336     

Curtis McDonald  Carina M. Alfaro-Franco 《Microchemical Journal》1984,30(2):194-200

Cobalt ions in aqueous thiocyanate solution react with Aliquat-336-xylene solution to form anion-association complex which is easily extracted into the organic phase. A typical extraction procedure involves extracting a solution which is 10 ppm in cobalt and 0.06 M,

5. Stripping of Cobalt from 2% Aliquat-336-Xylene Solutions

Hydroxide by ammonium hydroxide	408°
Hydroxide by ammonia	400°
Hydroxide by urea	475°
Hydroxide by aniline	546°
Hydroxide by sulpliitc	813°
Hydroxide by tannin	520°
Cupfcrron	745°
Camphoratc	478°
Dibromo-oxinate	817°

     

17.

Spectroscopic investigations of hydrogen bonding interactions in the gas phase: Part VI. A microwave spectroscopie determination of geometry for the heterodimer (CH2)3O⋯HF formed between oxetane and hydrogen fluoride: hydrogen bonding as a probe for lone pairs     

A.S. Georgiou  A.C. Legon  D.J. Millen 《Journal of Molecular Structure》1980

The hydrogen-bonded heterodimer formed between oxetane and hydrogen fluoride is identified and characterised by means of its IR and microwave spectra. The following rotational constants (MHz) and centrifugal distortion constants (kHz) have been derived:

Strippant	Cobalt stripped (%)
Na2S (M) 1.0	18.3
2.0	10.7
Na2SO3 (M) 0.1	10.7
0.5	49.6
1.0	52.9
EDA (%) 2.5	76.6
NaOH (M) 0.1	4.1
0.5	74.1
1.0	90.8
2.0	76.8
NH4OH (M) 0.1	24.1
0.5	91.8
1.0	97.5
2.0	99.9
EDTA (M) 0.02	>99.9
0.05	>99.9
0.1	>99.9
EDTA (%) 0.1	>99.9
0.5	>99.9
1.0	>99.9

     

18.

Sur la thermogravimt́rie des prćipitś analytiques: Dosage de l'indium     

Thérése Dupuis  Clément Duval 《Analytica chimica acta》1949

The authors discuss several aspects of the chemistry of indium, giving evidence for a hydrate 2ln₂O₃.H₂O and studying in detail the behaviour of indium sulphide heated in air. Compared with that of gallium, the oxinate is particularly stable.Compounds used for the gravimetric determination of indium should be heated to the following temperatures in order to give correct results:

A	B	C	ΔJ	ΔJK
(CH2)O3?HF	9217	2575.1	2350.6	11.3	?57.0
(CH2)3O?DF	9157(ass)	2544.7	2329.3	9.9	?56

     

19.

Performance of a new automatic carbon dioxide coulometer     

Edward W. D. Huffman  jr. 《Microchemical Journal》1977,22(4):567-573

The Coulometrics Inc. CO₂ coulometer has been shown to be an accurate and reliable CO₂ measuring device. The coulometric efficiency is essentially 100%. This means that the method can be considered as a standard reference method for CO₂. As with a CO₂ absorption tube, certain potential interferences must be considered, however, the removal of these interferences is well documented in the literature.The CO₂ coulometer has found a variety of applications in the author's

3. effect of flow rate on absorption of CO₂ by coulometer

Hydroxide by ammonia	345°
Hydroxide by hexamethylene tetramine	546°
Hydroxide by cyanate	475°
Sulphide	94–221°, 320–544°, 690°
Phosphate	477°
Luteocobaltic indichloride	100–105°
Oxinate	100–285°
Diethyldithiocarbamate	100–210°

     

20.

Methodology for high-flux absolute multielement neutron activation analysis — environmental baselines by analysis of tree rings     

Enzo Ricci 《Analytica chimica acta》1975

Multielement determinations by high-flux absolute n.a.a. require careful methodology to avoid systematic error. The ORNL high-flux facility with a thermal flux of 5 ·10¹⁴ cm^-2 s^-1 and a thermal-to-resonance flux ratio of

T004. Analysis of Knoxville tree-core samples^a

CaCO3 (mg)	C (mg)	Flow rate (cm3/min)	C found (mg)	C (%)
27.989	3.359	100	3.3669	12.03
28.604	3.432	200	3.4343	12.00
29.259	3.511	300	3.5149	12.01
33.808	4.057	400	4.0381	11.94
5.629	0.675	500	0.6760	12.01
10.311	1.237	500	1.2337	11.96
15.647	1.878	500	1.8706	11.95
35.214	4.226	500	4.1982	11.92
40.733	4.888	500	4.8212	11.84
59.678	7.161	500	7.0263	11.77
30.386	3.646	780	3.5941	11.83
29.781	3.574	780	3.5361	11.87
28.113	3.374	1150	3.2534	11.57

Element	Increment no.20 (1832–1838)	Increment no.8 (1932–1838)	Increment no.3 (1858–1863)	Increment no.1 (1868–1872)
					Core Number	Core Number	Core Number	Core Number
	1	3	1	3	1	3	1	3
Na	12.9(1.1)	2.67(3.3)	33.8(1.0)	11.2(1.6)	15.6(1.5)	31.4(1.2)	22.4(0.93)	9.9(1.8)
Mg	c	c	160(12)b	80(27)b	100(21)b	100(30)b	c	c
Al	15.2(5.4)	5.6(6.1)	12.5(3.8)	11.0(4.4)	7.8(6.6)	8.4(7.4)	6.5(14)	6.6(6.2)
Cl	15.4(9.1)	ND	66(5.4)	ND	ND	55(6.1)	26(5.5)	22(5.1)
K	205(2.6)	223(3.3)	493(1.8)b	457(1.9)b	478(1.9)b	439(2.1)b	449(1.8)	570(1.7)
Ca	1600(11)	ND	ND	ND	ND	ND	ND	ND
Cr	ND	ND	NDb	NDb	0.3(>30)b	0.6(>30)b	0.6(>30)b	ND
Mn	109(0.30)	107(0.23)	64.1(042)	108(0.32)	46.7(051)	66.8(0.44)	38.9(0.39)	45.0(0.34)
Fe	ND	ND	ND	ND	ND	19(19)	25(18)	ND
Co	ND	0.02(>30)	ND	ND	ND	ND	0.30(>30)	ND
Zn	7.2(7)	7.4(4.2)	13.0(2.4)	9.2(3.3)	5.6(4.0)	4.5(4.7)	ND	2.4(8.8)
Br	0.10(20)	ND	0.07(12)	ND	0.024(13)	ND	0.04(>30)	ND
Rb	ND	ND	0.9(13)	0.8(18)	0.8(15)	0.7(17)	ND	1.1(18)
Ag	ND	ND	1.06(3.0)	15.3(0.71)	0.15(15)	0.69(4.8)	0.11(28)	ND
Ba	11(7.3)	10(13)	3.2(16)	ND	3.0(15)	2.9(18)	ND	3(32)
W	ND	ND	ND	ND	ND	ND	0.06(29)	ND

a

Results in p.p.m followed by (per cent counting statistical error).

b

Computer forced result.Also V,Se,Sr,Sb,Cs and au (forced) were not detected.

c

Element possibly present but missed by peak-finding routine.7 35–45, was used in developing an instrumental absolute multielement method. The detector was calibrated for absolute counting with two independent sets of radioactivity standards for four detector- -source distances; the absolute activities of the standards were reproducible within accuracies of 9%. Five sources of systematic error were investigated: (a) correction for counting of cylindrical sources for 26 γ-ray energies reached 14–17% for photon energies below 500 keV; (b) flux variation during bombardment and within the irradiation capsule volume was not significant; (c) samples were sufficiently stable during high-flux bombardment; (d) multi-element impurities in accessory materials (polyethylene and “Nucleopore” filters) were not significant; (e) correction for sample activation during rabbit transfer was necessary for short bombardments, e.g., 8.6 % for 6 s and 19.6 % for 4 s. This methodology resulted in accuracies of 10–15 % for most elements, as determined by analysis of N.B.S. orchard leaves and coal and of Bowen's kale standards. The method was applied to a preliminary chronological study of environmental baselines and contamination levels, based on tree ring samples, covering a period of 100 years.

     

Analysis of nitrate-perchlorate mixtures by difference spectrophotometry

Nitron and tetraphenylarsonium chloride react with a cobaltous salt in the presence of thiocyanate to form blue ion-association complexes, which can be extracted with organic solvents. This fact has been made the basis for the analysis of mixtures of nitrate and perchlorate by difference spectrophotometry. An aliquot of the sample solution is treated with a known excess of tetraphenylarsonium chloride to precipitate perchlorate only. After separating off the precipitate, the excess of reagent is determined in the supernatant liquid as tetraphenylarsonium cobaltothiocyanate and the perchlorate content can be found from a calibration curve. Another aliquot is treated with an excess of nitron to precipitate both anions; the excess of nitron is then determined as nitron

2. Analysis of Nitrate-Perchlorate Mixtures

Polarographic determination of antimony in leadantimony alloys

A polarographic method for the determination of antimony in lead-antimony alloys has been developed. It was found that the interference due to the presence of varying concentrations of lead and hydrochloric acid would be eliminated by the addition of potassium chloride.

t001. The method gave satisfactory results within the range:

Luminol-dependent chemiluminescence analysis of cellular and humoral defects of phagocytosis using a chem-glo photometer

In summary, this report describes the conditions under which luminol has been utilized to measure phagocytosis-associated metabolic events in activated human PMNs and rabbit and dog alveolar macrophages. We feel that this system may have wide applicability to both clinical and experimental situations. Some possible applications are shown in the following table.

Potential Applications of Luminol-Amplified Chemiluminescence

Determination of acidic dissociation constants of several vic-dioximes

The acidic dissociation constants of three vic-dioximes have been determined from spectrophotometric data. The results may be summarized as follows:

Amperometric titration of copper in brass

A direct amperometric titration of copper is described; o-(p-tolylsulfonamido) aniline serves as titrant. The optimum conditions are discussed and the method is applied to the analysis of copper in brass alloys.

t001. IV. Analysis of various samples in which copper was determined (Values given as percentages)

The vibrational ground state rotational spectroscopic constants and structure of the HCN dimer

Rotational spectra have been assigned for four isotopic species of the linear HCN dimer in the vibrational ground state. The spectroscopic constants are

Potentiometric study of silver(I)-thiosemicarbazonates

A potentiometric method is described for the determination of thiosemicarbazones involving the formation of a complex with Ag(I). This method is proposed for thiosemicarbazones of the following carbonyl compounds: salicylaldehyde, p-hydroxybenzaldehyde, benzaldehyde, picolinaldehyde, 6-methylpicolinaldehyde and p-dimethylaminebenzaldehyde. Stability constants of the complexes are determined by Ringbom and Harju's method.

FIG. 2. Variation of pAg + logα_{PAT (H)} + log ([Ag?PAT)]/[PAT])

2. Formation Constants of the Silver-Thiosemicarbazonates

Sur la thermogravimétrie des précipités analytiques : Dosage du gallium

With the help of the Chcvcnard thcrmobalancc the authors have determined the minimum temperatures necessary for quantitatively converting the derivatives of gallium into oxide Ga₂0₃.

Solvent extraction studies of cobalt in aqueous thiocyanate solutions using Aliquat-336

Cobalt ions in aqueous thiocyanate solution react with Aliquat-336-xylene solution to form anion-association complex which is easily extracted into the organic phase. A typical extraction procedure involves extracting a solution which is 10 ppm in cobalt and 0.06 M,

5. Stripping of Cobalt from 2% Aliquat-336-Xylene Solutions

Spectroscopic investigations of hydrogen bonding interactions in the gas phase: Part VI. A microwave spectroscopie determination of geometry for the heterodimer (CH2)3O⋯HF formed between oxetane and hydrogen fluoride: hydrogen bonding as a probe for lone pairs

The hydrogen-bonded heterodimer formed between oxetane and hydrogen fluoride is identified and characterised by means of its IR and microwave spectra. The following rotational constants (MHz) and centrifugal distortion constants (kHz) have been derived:

Sur la thermogravimt́rie des prćipitś analytiques: Dosage de l'indium

The authors discuss several aspects of the chemistry of indium, giving evidence for a hydrate 2ln₂O₃.H₂O and studying in detail the behaviour of indium sulphide heated in air. Compared with that of gallium, the oxinate is particularly stable.Compounds used for the gravimetric determination of indium should be heated to the following temperatures in order to give correct results:

Performance of a new automatic carbon dioxide coulometer

The Coulometrics Inc. CO₂ coulometer has been shown to be an accurate and reliable CO₂ measuring device. The coulometric efficiency is essentially 100%. This means that the method can be considered as a standard reference method for CO₂. As with a CO₂ absorption tube, certain potential interferences must be considered, however, the removal of these interferences is well documented in the literature.The CO₂ coulometer has found a variety of applications in the author's

3. effect of flow rate on absorption of CO₂ by coulometer

Methodology for high-flux absolute multielement neutron activation analysis — environmental baselines by analysis of tree rings

Multielement determinations by high-flux absolute n.a.a. require careful methodology to avoid systematic error. The ORNL high-flux facility with a thermal flux of 5 ·10¹⁴ cm^-2 s^-1 and a thermal-to-resonance flux ratio of

T004. Analysis of Knoxville tree-core samples^a