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1.
F. Lagarde M. B. Amran M. J. F. Leroy C. Demesmay M. Ollé A. Lamotte H. Muntau P. Michel P. Thomas S. Caroli E. Larsen P. Bonner G. Rauret M. Foulkes A. Howard B. Griepink E. A. Maier 《Analytical and bioanalytical chemistry》1999,363(1):18-22
Tuna fishes were collected in the Straits of Messina (Italy), were dissected and dorsal muscles minced, freeze-dried, ground and sieved. The obtained powder was stabilised by γ-irradiation and filled into brown glass bottles. The homogeneity and stability at +20?°C and +40?°C were verified with regards to the total arsenic, dimethylarsinic acid and arsenobetaine contents. Ten laboratories participated in the certification study. All participants had demonstrated beforehand their ability to produce accurate results for the As speciation in fish tissue. The certified values are: total arsenic (4.8 ± 0.3) mg/kg, arsenobetaine (52 ± 3) μmol/kg, dimethylarsinic acid (2.0 ± 0.3) μmol/kg. The material is available from the BCR since early 1998. 相似文献
2.
Susan Londesborough J. Mattusch Rainer Wennrich 《Analytical and bioanalytical chemistry》1999,363(5-6):577-581
The HPLC separation of eight anionic, cationic or neutral arsenic species (arsenite, arsenate, monomethylarsonic acid, dimethylarsinic
acid, arsenobetaine, arsenocholine, trimethylarsine oxide and tetramethylarsonium ion) on a high-capacity, anion-exchange
column (Ion Pac AS 7, Dionex) was studied. The separation was performed during one run with a nitric acid gradient ranging
from pH 4–1.3. The influence of sodium dodecyl sulfate (SDS), sodium octyl sulfate (SOS) and 1,2-benzenedisulfonic acid (BDSA)
as ion pairing eluent modifiers was investigated. In addition the effect of elevated temperatures (30 to 40 °C) was studied.
The best results were obtained at room temperature of 20 °C with 0.05 mM benzenedisulfonic acid as the eluent modifier. The
chromatograph was connected to an ICP-MS via a cross-flow nebulizer. Detection limits obtained with the optimized chromatographic
separation were 0.16–0.60 μg As L–1 for different species. The proposed speciation method was applied to the determination of arsenic species in the DORM-2 reference
material (Dogfish Muscle) and in aqueous extracts of mushrooms collected on arsenic contaminated ground.
Received: 3 August 1998 / Revised: 17 September 1998 / Accepted: 21 September 1998 相似文献
3.
J. Feldmann Katie John Paramee Pengprecha 《Analytical and bioanalytical chemistry》2000,368(1):116-121
Cation exchange and anion exchange liquid chromatography were coupled to an ICP-MS and optimised for the separation of 13
different arsenic species in body fluids (arsenite, arsenate, dimethylarsinic acid (DMAA), monomethylarsonic acid (MMAA),
trimethylarsine oxide (TMAO), tetramethylarsonium ion (TMA), arsenobetaine (AsB), arsenocholine (AsC), dimethylarsinoyl ethanol
(DMAE) and four common dimethylarsinoylribosides (arsenosugars). The arsenic species were determined in seaweed extracts and
in the urine and blood serum of seaweed-eating sheep from Northern Scotland. The sheep eat 2–4 kg of seaweed daily which is
washed ashore on the most northern Island of Orkney. The urine, blood and wool of 20 North Ronaldsay sheep and kidney, liver
and muscle from 11 sheep were sampled and analysed for their arsenic species. In addition five Dorset Finn sheep, which lived
entirely on grass, were used as a control group. The sheep have a body burden of approximately 45–90 mg arsenic daily. Since
the metabolism of arsenic species varies with the arsenite and arsenate being the most toxic, and organoarsenic compounds
such as arsenobetaine the least toxic compounds, the determination of the arsenic species in the diet and their body fluids
are important. The major arsenic species in their diet are arsenoribosides. The major metabolite excreted into urine and blood
is DMAA (95 ± 4.1%) with minor amounts of MMAA, riboside X, TMA and an unidentified species. The occurrence of MMAA is assumed
to be a precursor of the exposure to inorganic arsenic, since demethylation of dimethylated or trimethylated organoarsenic
compounds is not known (max. MMAA concentration 259 μg/L). The concentrations in the urine (3179 ± 2667 μg/L) and blood (44
± 19 μg/kg) are at least two orders of magnitude higher than the level of arsenic in the urine of the control sheep or literature
levels of blood for the unexposed sheep. The tissue samples (liver: 292 ± 99 μg/kg, kidney: 565 ± 193 μg/kg, muscle: 680 ±
224 μg/kg) and wool samples (10 470 ± 5690 μg/kg) show elevated levels which are also 100 times higher than the levels for
the unexposed sheep.
Received: 29 February 2000 / Revised: 26 April 2000 / Accepted: 1 May 2000 相似文献
4.
R. Haas Torsten C. Schmidt Klaus Steinbach Eberhard von L?w 《Fresenius' Journal of Analytical Chemistry》1998,361(3):313-318
Urinary arsenic speciation is considered to be an effective procedure to differentiate between toxic inorganic and less toxic
organic arsenic exposure. The aim of the present work was to develop a new method for the simultaneous determination of the
main arsenic species so far detected in urine: arsenite (As(III)), arsenate (As(V)), methylarsonic acid (MA), dimethylarsinic
acid (DMA), and arsenobetaine (AsB). The method is based on anion exchange HPLC coupled on-line to an inductively coupled
plasma mass spectrometer (ICP-MS) for element specific detection. Experimental parameters, such as column type and composition
of the mobile phases were optimized in order to get best separation, little matrix interferences, lowest detection limits,
and short total times of analyses. Best chromatographic conditions were obtained by using a Dionex AS14 anion exchange column
and a gradient elution with tetramethylammonium hydroxide and ammonium carbonate as eluting compounds. The detection limits
(3 σ) were found to be in the sub μg L–1 range. The method was applied to analyze different urine samples from persons with and without consumption of seafood. To
avoid significant matrix influences, samples (24 h urine) had to be diluted 1 : 5 with water and were filtered through a 0.45
μm filter prior to analyses. Special attention was focused on the validation of the method according to the regulations of
the “Deutsche Forschungsgemeinschaft” (DFG) for the analyses of hazardous substances in biological materials.
Received: 22 December 1997 / Revised: 18 February 1998 / Accepted: 22 February 1998 相似文献
5.
F. Lagarde M. B. Amran M. J. F. Leroy C. Demesmay M. Ollé A. Lamotte H. Muntau P. Michel P. Thomas S. Caroli E. Larsen P. Bonner G. Rauret M. Foulkes A. Howard B. Griepink E. A. Maier 《Fresenius' Journal of Analytical Chemistry》1999,363(1):5-11
Six interlaboratory studies were organised by the Standard, Measurement and Testing Programme of the European Commission on
the determination of arsenic species (arsenobetaine, arsenocholine, monomethylarsonic acid, dimethylarsinic acid, As(III)
and As(V)) in marine matrices and soil. A step-by-step approach was used and a meeting was held at the end of each study to
help the participants to discover errors and to improve their analytical methods. The successive steps investigated the calibration
procedures on various solutions, the separation and derivatisation techniques on solutions and extracts and the extraction
on mussel and fish tissues. All materials used for the study were monitored for their stability. Verified calibration solutions
and compounds were distributed to the participants in each exercise in order to trace calibration problems. The agreement
between the results improved regularly and at the end of the six campaigns allowed the certification of a reference material
of tuna-fish tissue (BCR-CRM 627) for its total arsenic, arsenobetaine and dimethylarsinic acid contents.
Received: 31 March 1998 / Revised: 20 July 1998 / Accepted: 25 July 1998 相似文献
6.
F. Lagarde M. B. Amran M. J. F. Leroy C. Demesmay M. Ollé A. Lamotte H. Muntau P. Michel P. Thomas S. Caroli E. Larsen P. Bonner G. Rauret M. Foulkes A. Howard B. Griepink E. A. Maier 《Analytical and bioanalytical chemistry》1999,363(1):5-11
Six interlaboratory studies were organised by the Standard, Measurement and Testing Programme of the European Commission on
the determination of arsenic species (arsenobetaine, arsenocholine, monomethylarsonic acid, dimethylarsinic acid, As(III)
and As(V)) in marine matrices and soil. A step-by-step approach was used and a meeting was held at the end of each study to
help the participants to discover errors and to improve their analytical methods. The successive steps investigated the calibration
procedures on various solutions, the separation and derivatisation techniques on solutions and extracts and the extraction
on mussel and fish tissues. All materials used for the study were monitored for their stability. Verified calibration solutions
and compounds were distributed to the participants in each exercise in order to trace calibration problems. The agreement
between the results improved regularly and at the end of the six campaigns allowed the certification of a reference material
of tuna-fish tissue (BCR-CRM 627) for its total arsenic, arsenobetaine and dimethylarsinic acid contents.
Received: 31 March 1998 / Revised: 20 July 1998 / Accepted: 25 July 1998 相似文献
7.
Comparison of sample digestion procedures for the determination of arsenic in certified marine samples using the FI-HG-AAS-technique 总被引:2,自引:0,他引:2
High-pressure digestion and a closed-vessel microwave heated system, both employing a mixture of nitric acid and hydrogen
peroxide as digesting agent, were tested for decomposing the certified samples of BCR 278 mussel tissue (Mytilus edulis) and of BCR 422 cod muscle to determine arsenic by use of FI-HG-AAS. While the microwave system is insufficient to mineralize
arsenic in marine samples (arsenic recoveries of 13±10% in BCR 278, 2±1% in BCR 422; n=4), high-pressure ashing at 300 °C
results in recovery percentages of 56±15% (n=4) in mussel tissue (BCR 278) and of 25±10% (n=4) in cod muscle (BCR 422). A
dry ashing procedure is given as a reference digestion, yielding complete recoveries of arsenic for both materials. The nitrite
interference arising during measurement can be entirely overcome by using an amino sulfuric acid concentration of about 350 mmol/L
in the solutions for measurement.
Received: 30 April 1996/Revised: 12 July 1996/Accepted: 16 July 1996 相似文献
8.
A method based on solid phase extraction was developed for the determination of the herbicide triallate and its metabolite
2,3,3-trichloro-prop-2-en-sulfonic acid (TCPSA). Soil samples were extracted with methanol and diluted with water to yield
a methanol/water ratio of 1 : 4. Triallate was adsorbed on C18 cartridges while TCPSA was enriched on quaternary amine anion exchange resins. Cartridges were eluted with methanol/ethyl
acetate and methanol/sulfuric acid mixture, respectively. TCPSA methyl ester was formed using trimethyl orthoformate and subsequently
analyzed by GC/ECD. Determination limits of both target compounds were 5 μg/kg soil with recoveries of 100 ± 12% for triallate
and 57 ± 5% for TCPSA. In water analysis, determination limits were 0.05 μg/L with recoveries of 84 ± 14% for triallate and
100 ± 22% for TCPSA. In laboratory batch experiments, concentration of triallate decreased from 2690 to 1550 μg/kg soil within
59 days. 14 days after triallate application, TCPSA was determined to be 14 μg/kg which increased to 98 μg/kg soil at the
end of the incubation period. Soil/water distribution coefficients in loamy sand soil were 102 for triallate and 0.02 for
TCPSA which indicated a higher leaching tendency of the polar metabolite.
Received: 2 July 1997 / Revised: 15 September 1997 / Accepted: 25 September 1997 相似文献
9.
As one of the experiments to pursue marine circulation of arsenic, we studied microbiological conversion of arsenocholine to arsenobetaine, because arsenocholine may be a precursor of arsenobetaine in these ecosystems. Two culture media, 1/5 ZoBell 2216E and an aqueous solution of inorganic salts, were used in this in vitro study. To each medium (25 cm3) were added synthetic arsenocholine (0.2%) and about 1 g of the sediment, and they were aerobically incubated at 25°C in the dark. These conversion experiments were performed in May and July 1990. In both seasons, two or three metabolites were derived in each mixture. These metabolites were purified using cation-exchange chromatography. Their structures were confirmed as arsenobetaine, trimethylarsine oxide and dimethylarsinic acid by high-performance liquid chromatography, thin-layer chromatography, FAB mass spectrometry and a combination of gas-chromatographic separation with hydride generation followed by a cold-trap technique and selected-ion monitoring mass spectrometric analysis. From this and other evidence it is concluded that, in the arsenic cycle in these marine ecosystems, as recently postulated by us, the pathway arsenocholine → arsenobetaine → trimethylarsine oxide → dimethylarsinic acid → methanearsonic acid → inorganic arsenic can be carried out by micro-organisms alone. 相似文献
10.
A. Martín-Esteban P. Fernández C. Cámara G. N. Kramer E. A. Maier 《Fresenius' Journal of Analytical Chemistry》1999,363(7):632-640
The preparation of a certified reference material of polar pesticides in freeze-dried water is described. The pesticides
selected were atrazine, simazine, carbaryl, propanil, linuron, fenamiphos and permethrin which were added to 6000 litres of
tap water at 50–80 μg · L–1 (200–320 μg · L–1 for permethrin) level in presence of NaCl (2.5 g · L–1) prior lyophilization. After the freeze-drying process the residue was rehomogenized, filled into amber glass bottles and
stored at –20 °C, +4 °C and +20 °C. All pesticides were determined by HPLC/diode array detector, except permethrin which was
determined by GC/ECD. The results obtained for atrazine, simazine, carbaryl, propanil, linuron and fenamiphos showed no within-
or between-bottle inhomogeneity, however the material was non-homogeneous for permethrin and therefore this was withdrawn
from further studies. With respect to the stability for over one year, all pesticides were stable at –20 °C. At +4 °C all
pesticides were stable for at least 9 months and at +20 °C the stability was demonstrated only during the first month of storage.
The content (mass fractions) of atrazine, simazine, carbaryl, propanil and linuron in freeze-dried water (CRM 606) was certified
by an interlaboratory testing and a certification campaign.
Received: 7 September 1998 / Revised: 13 November 1998 / Accepted: 21 November 1998 相似文献
11.
Hüseyin Ba Mustafa Lale A. Rehber Türker 《Fresenius' Journal of Analytical Chemistry》1999,363(3):224-230
By using the adsorbent Saccharomyces cerevisiae immobilized on sepiolite an adsorption-elution method was developed for the preconcentration of Cu, Zn, and Cd followed by
flame atomic absorption spectrometry (FAAS). Recoveries were 98.3 ± 0.4% for Cu, 94.2 ± 0.3% for Zn, and 99.04 ± 0.04% for
Cd at 95% confidence level obtained by the column method. The influence of sea water matrix elements on the separation of
the trace elements was also assessed by using the column procedure. The breakthrough capacities were found to be 74 μmol/g
for copper, 128 μmol/g for zinc and 97 μmol/g for cadmium. After optimization the proposed method was applied to the trace
metal determination in sea and river water.
Received: 8 June 1998 / Revised: 8 September 1998 / Accepted: 16 September 1998 相似文献
12.
R. Mu?oz Olivas Philippe Quevauviller O. F. X. Donard 《Fresenius' Journal of Analytical Chemistry》1998,360(5):512-519
Long term stability of organic selenium compounds (selenocystine, selenomethionine, trimethylselenonium ion) has been studied
over a one year period for 2 analyte concentrations: 25 and 150 μg/L Se, at pH 4.5 in the dark, under different storage conditions:
temperature of –20°C, 4°C, 20°C, 40°C; in Pyrex, Teflon, or polyethylene containers; in an aqueous matrix or in the presence
of a chromatographic counter ion (pentyl sulfonate at 10–4 mol/L concentration). Light effects have also been tested. The stability of the selenium species was monitored by HPLC-ICP/MS.
Storage conditions can drastically alter the stability of organic selenium species. Organoselenium compounds were shown to
be stable in the dark over a one year period in an aqueous matrix at pH 4.5 in Pyrex containers at both 4°C and 20°C. Pyrex
vials exposed to natural sunlight at room temperature resulted in a steady decrease of the selenoamino acid concentration.
Teflon containers caused losses of less than 25% at both 4° C and 20° C in the dark. However, polyethylene vials presented,
at all temperatures tested, a rapid decrease of the TMSe+ concentration. The stability of the Se species studied did not show significant differences between 4° C and 20° C in any
container material used. Storage of solutions at 40° C led to slight differences between the Pyrex and Teflon containers.
However, polyethylene presented a drastic decrease of the three species over time at this higher temperature. Solutions frozen
at –20° C in polyethylene vials did not stabilize the TMSe+ signal. Finally, concentrations and matrices of the samples did not significantly affect the stability of the species.
Received: 15 July 1996 / Revised: 14 July 1997 / Accepted: 18 July 1997 相似文献
13.
F. Lagarde Z. Asfari M. J. F. Leroy C. Demesmay M. Ollé A. Lamotte P. Leperchec E. A. Maier 《Fresenius' Journal of Analytical Chemistry》1999,363(1):12-17
Interlaboratory studies have been organised by the Standards, Measurement and Testing Programme in order to certify the content
of some chemical forms of arsenic in fish and mussel tissue, soil and sediment. Among the six compounds of interest (arsenite,
arsenate, dimethylarsinic and monomethylarsonic acids, arsenobetaine and arsenocholine) only four are commercially available.
Arsenobetaine and arsenocholine of well defined purity had therefore to be prepared by the pilot laboratories in charge of
the management of the project. The present work deals with the synthesis and characterisation of these two compounds and the
certification of the content of arsenobetaine in a standard solution (BCR-CRM 626).
Received: 31 March 1998 / Revised: 20 July 1998 / Accepted: 25 July 1998 相似文献
14.
Sánchez-Rodas D Luis Gómez-Ariza J Oliveira V 《Analytical and bioanalytical chemistry》2006,385(7):1172-1177
A rapid extraction procedure has been developed for speciation of arsenic in chicken tissue. Water, methanol–water (1:1),
and methanol–chloroform (1:1) were tested as extraction media. Individual use of an ultrasonic bath, a microwave oven, or
an ultrasonic probe was not sufficient for quantitative recovery of As(III), dimethylarsinate, monomethylarsonate, As(V),
and arsenobetaine in spiked samples of chicken tissue. A new extraction procedure using a methanol–water mixture and a microwave
oven then an ultrasonic probe enabled extraction of the arsenic species in 7 min with efficiencies ranging from 80 to 100%.
HPLC–UV–HG–AFS was used for the determinations. The extraction procedure was 100% efficient when applied to real samples of
chicken tissue. AsB (48±5 μg As kg −1) and one containing-arsenic feed additive, Nitarsone (227±5 μg As kg −1) were detected. 相似文献
15.
A successful flow-through system was developed for trace analysis of copper using DPASV with a glassy-carbon electrode. Periodical
chemical regeneration of the electrode with a 1 mol/L NaOH solution increased sensitivity and precision. The method was shown
to be applicable with a detection limit of 0.56 μg/L, with a determination time of less than 7 min per measurement (without
deaeration time). The drawback of the system is the 10 min deaeration time. The system gave an accuracy of 0.090±0.005% for
a certified reference material of low alloy steel containing 0.090±0.004% Cu. Applicability to various fresh water samples
with a Cu content between 1.57 and 13.11 μg/L with an RSD<2.36% is illustrated.
Received: 11 March 1996/Revised: 1 July 1996/Accepted: 4 July 1996 相似文献
16.
A successful flow-through system was developed for trace analysis of copper using DPASV with a glassy-carbon electrode. Periodical
chemical regeneration of the electrode with a 1 mol/L NaOH solution increased sensitivity and precision. The method was shown
to be applicable with a detection limit of 0.56 μg/L, with a determination time of less than 7 min per measurement (without
deaeration time). The drawback of the system is the 10 min deaeration time. The system gave an accuracy of 0.090±0.005% for
a certified reference material of low alloy steel containing 0.090±0.004% Cu. Applicability to various fresh water samples
with a Cu content between 1.57 and 13.11 μg/L with an RSD<2.36% is illustrated.
Received: 11 March 1996/Revised: 1 July 1996/Accepted: 4 July 1996 相似文献
17.
An improved analytical procedure is presented for the separation and simultaneous determination of hydride-forming (toxic)
and not hydride-forming (non-toxic) arsenic species in human urine. Separation was performed by cation-exchange chromatography
using a new solid phase type based on the continuous bed chromatography (CBC) technology. This column permits by a factor
of 4 higher flow rates than conventional columns resulting in a drastical reduction of retention times without any loss of
resolution. Using this type of column, arsenobetaine (AsBet), arsenocholine (AsChol), and dimethylarsinic acid (DMA) were
separated from the more toxic arsenic species arsenous acid (As(III)), arsenic acid (As(V)), and methylarsonic acid (MA) within
only 4 min. The HPLC system was coupled via a flow injection system and either a UV or a microwave (MW) reactor to the HG-AAS
instrument. UV photolysis and MW digestion were used to transform AsBet and AsChol to hydride-forming species and to make
them accessible to HG-AAS. UV photolysis turned out to be more suitable for this application than MW digestion, because the
latter technique led to peak broadening and poorer performance. The described procedure was applied to the determination of
arsenic species in urine samples of non-occupationally exposed persons before and 12 h after seafood consumption. Detection
limits were about 1 μg/L for each arsenic species. After consumption, the AsBet and DMA excretion increased by at least a
factor of 150 for AsBet and by a factor of 6 for DMA, respectively, while the excretion of the other species did not increase
significantly. This invalidates the use of total urinary arsenic as well as total hydride-forming arsenic as an indicator
for exposure to inorganic arsenic.
Received: 12 August 1998 / Revised: 30 October 1998 / Accepted: 24 November 1998 相似文献
18.
A. N. Araújo Joan Gracia Jose´ L. F. C. Lima Manel Poch M. Lu´cia M. F. S. Saraiva 《Analytical and bioanalytical chemistry》1997,357(8):1153-1156
A procedure is described for the colorimetric determination of iron in infant fortified formulas based on sequential injection
analysis (SIA). Iron(III) complexation with thiocyanate is used as colour developing reaction. The system enables the determination
of iron in the samples (after digestion by dry ashing and treatment with 0.2 mol/L nitric acid in the range of 0.50–20.0 mg/L,
consuming 140 μL of the sample and 8 mg thiocyanate per determination. The reactor geometry and the adjustment of the ionic
content of the calibration solutions is important for the accuracy of the results. A regression line according to the equation
[Fe(III) (mg/L)]SIA=−0.3(±0.4)+1.03(±0.04) [Fe(III) (mg/L)]FAAS was obtained after comparative analysis of a set of 12 samples. The measurement rate was 34 s, thus allowing to analyze 100
samples per hour with a relative standard deviation lower than 2%.
Received: 30 July 1996/Revised: 1 October 1996/Accepted: 4 October 1996 相似文献
19.
Dula Amarasiriwardena Kamal Sharma R. M. Barnes 《Fresenius' Journal of Analytical Chemistry》1998,362(5):493-497
The presence of lead as a contaminant in calcium supplements has aroused considerable public health interest in recent years.
In this investigation lead and lead isotope ratios were determined by ICP-MS in ten brands of calcium supplements after high
pressure/temperature digestion. Calcium supplements (200 to 250 mg) were digested in 2 mL of nitric acid at 230 °C and at
a pressure of 1770 psi (1.2 × 104 kPa). Lead concentrations were determined by matrix-matched lead standards prepared in a high-purity calcium carbonate matrix.
Good recoveries of lead and calcium were obtained for certified animal bone reference material. High levels of Pb (8 to 28
μg Pb per g of calcium) were found in calcium supplements that contain dolomite or bone meal. Chelated and refined calcium
supplements had lower Pb levels (0.8 to 0.9 μg Pb/g Ca). Application of lead isotope ratios to distinguish the origin of calcium
sources was also explored.
Received: 9 June 1998 / Revised: 20 July 1998 / Accepted: 25 July 1998 相似文献
20.
液相色谱-电感耦合等离子体质谱法测定稻米中的5种砷形态 总被引:2,自引:0,他引:2
建立了稻米中砷酸根[As(Ⅴ)]、亚砷酸根[As(Ⅲ)]、砷甜菜碱(AsB)、一甲基砷(MMA)和二甲基砷(DMA)的液相色谱-电感耦合等离子体质谱(LC-ICP-MS)检测方法。以0.3 mol/L硝酸水溶液为提取试剂,样品在石墨消解仪中于95 ℃消解1.5 h,上清液供LC-ICP-MS分析。5种砷形态采用Dionex IonPac AS19阴离子交换柱(250 mm×4 mm)分离,经ICP-MS检测。比较了4种提取液对稻米中5种砷形态的提取效率,并对提取溶剂的浓度、提取温度和提取时间等条件进行了优化。通过加标回收试验结合测定标准物质考察了方法准确度及精密度,在2个加标水平上各形态的回收率为89.6%~99.5%,RSD(n=5)不大于3.6%,大米标准物质中各形态之和的测定结果与其标准值吻合,5种砷形态的线性范围AsB和DMA为0.05~200 μg/L,As(Ⅲ)和MMA为0.10~400 μg/L,As(V)为0.15~600 μg/L,方法检出限为0.15~0.45 μg/kg。结果表明,本方法简单、灵敏、耐用,可用于稻米中5种砷形态的准确定量和风险评估。 相似文献