Spectrophotometric and Indirect Determination of Lincomycin by Atomic Absorption Spectroscopy (AAS)

Abstract

The reaction of lincomycin with cupric ions in alkaline medium was taken as a basis for the colorimetric and indirect atomic absorption spectrometric (AAS) determination of lincomycin hydrochloride.

The AAS procedure was based on the extraction of copper-lincomycin complex at pH 11, into n-butanol. The copper content in this extract was determined by AAS. The response was linear for up to 30 μg ml^?1 of lincomycin. The method is accurate, sensitive and simple.

The proposed methods were applied to pharmaceutical preparations with fine accuracy.     

高纯碳酸锂中痕量磷,砷的孔雀绿—磷（砷）酸钼浮膜分光光度法测定

本文研究了孔雀绿与磷（砷）酸钼离子对膜的形成条件，并依此与基体分离，进行痕量磷，砷的浮膜－分光光度法测定。选用硫酸为介质，考察了２５种共存离子对测定的影响。拟定了高纯碳酸锂中痕量磷，砷的分析方法，操作简便，结果令人满意。     

顶空冷原子吸收间接测定水中微量硫化物

水中硫化物测定是评价水质污染的重要指标,目前检测方法有化学比色法^[1],火焰原子吸收间接法^[2],导数导波极谱法^[3]等。前者操作麻烦,灵敏度低;后者仪器昂贵,操作复杂,本文提出用顶空冷原子吸收法间接测定水中微量硫化物,样品无需任何处理,直接取样检测,操作简便快速,结果准确,对生活饮用水分析的结果满意。     

间接原子吸收光谱法测定药物制剂中的西米替丁

本文提出了流动注射原子吸收光谱法间接测定西米替丁的新方法。基于西米替丁与Ag（I）反应可以生成白色的沉淀,经流动注射在线过滤稀释,以原子吸收光谱法测定反应剩余银离子的量来间接测定西米替丁的量。在优化条件下西米替丁浓度在2～80mg／L范围内与吸光度呈良好的线性关系,回收率为97．0％～104．3％。方法用于片剂西米替丁的测定,结果满意。     

Indirect Atomic Absorption Spectrometric (AAS) Determination of Atenolol

Abstract

The Cu(II)-atenolol complex was prepared, and characterized by elemental analysis and spectroscopic techniques (via. IR, electronic and EPR spectra). The spectral results obtained indicate tetrahedral geometry around the Cu(II) ion. An indirect atomic absorption spectrometric method was undertaken to estimate atenolol in pharmaceutical preparations, based on its reaction with Cu²⁺ in alkaline medium. The method is simple, rapid, accurate and sensitive.     

氢化物发生原子荧光法测定水中痕量砷和汞

研究了用氢化物发生原子荧光法测定水中痕量坤和汞，此法是在盐酸介质中，以硼氢化钾作还原剂，将被测元素转化为挥发性氢化物，以高纯氩气作为载气将挥发性氢化物从母液中分离，并导入石英炉原子化器中原子化，以特种空心阴极灯作激发光源，激发被测元素原子发出荧光，荧光强度值在一定范围内与被测元素的浓度成正比。该法灵敏度高，精密度好，准确度高，砷和汞的检出限分别为0．0618和0．0158μg.L^-。     

Determination of Pb(II) and Cu(II) by Electrothermal Atomic Absorption Spectrometry after Preconcentration by a Schiff Base Adsorbed on Surfactant Coated Alumina

1,2-Bis（salicylidenamino）ethane loaded onto sodium dodecyl sulfate-coated alumina was used as a new chelating sorbent for the preconcentration of traces of Pb（Ⅱ） and Cu（Ⅱ） prior to atomic absorption spectrometric determination. The influence of pH, flow rates of sample and eluent solutions, and foreign ions on the recovery of Pb（Ⅱ） and Cu（Ⅱ） by this sorbent has been studied. The retained ions were eluted with 4 mol·L nitric acid and determined by electrothermal atomic absorption spectrometry （ETAAS）. The data of limit of detection （3σ） for Pb（Ⅱ） and Cu（Ⅱ） were found to be 8.57 and 2.69 ng·L^-1 respectively, while the enrichment factor for both ions was 100. The proposed method was successfully applied to determination of lead and copper in different water samples.     

Determination of Arsenic in Beverages and Foods by Hydride Generation Atomic Absorption Spectroscopy

Abstract

The determination of the arsenic content of foods and beverages by a technique involving a magnesium nitrate aided dry ashing step followed by an arsine generation atomic absorption finish is described. Recoveries of various arsenic species added prior to ashing was excellent. Total arsenic concentrations found in samples of beverages ranged from less than 10 to 265 ppb and in foods from 20 to 9290 ppb. The sensitivity of the technique is approximately ten-fold better than obtainable with commercially available hydride generation atomic absorption units.     

Kinetic Determination of Nanogram Amounts of Mo(VI) in Solution

A new inhibitory reaction is proposed and a kinteic method developed for the determination of ultra‐micro amounts of Mo(VI) on the basis of its inhibitory activity in oxidation of trimethylenediamine ‐N,N,N′,N′‐tetraacetic acid (TDTA) by KMnO₄ in the presence of hydrochloric acid. Under optimal conditions the sensitivity of the method is 0.5 ng/cm³. The probable relative error is 2.9–3.5% for the concentration range 7.5–2.0 ng/cm³ of Mo(VI). The effect of certain foreign ions upon the reaction rate were determined for the assessment of the selectivity of the method. The selectivity of the method is relatively good. Kinetic equations were proposed for the investigated process. A method has been applied for determination of Mo(VI) in a certain kind of steel.     

Determination of Silver in Plants by Flameless Atomic Absorption Spectrometry and Neutron Activation Analysis

Abstract

Three analytical techniques suitable for determining silver concentrations in plants are presented and compared. Graphite furnace atomic absorption spectrometry performed directly on sample digests was the most sensitive and convenient. Neutron activation analysis, measuring ^110mAg gave good reproducibility, but lower sensitivity. A cyclic activation scheme to generate and detect the short-lived isotope ¹¹⁰Ag was useful as a quick reconnaissance technique, but interference from ⁷⁶As reduced its effectiveness.

Data are presented on the silver content of terrestrial plants. Background silver concentrations for lichens and bryophytes collected from Wales, U.K. were <0.07μgg^?1. Samples collected from areas contaminated by derelict metal mines contained between 0.1-1.0μAgg^?1. The aerial portions of vascular species usually contained less silver than bryophytes growing on the same substrate. Fungi are shown to bioconcentrate silver to a greater extent than cadmium, copper or lead.     

火焰原子吸收光谱法间接测定非金属材料中氯

报道了火焰原子吸收光谱法（ＦＡＡＳ）间接测定非金属材料中氯的方法，采用ＡｇＣｌ沉淀，测定剩余Ａｇ~＋间接求出氯含量。方法的特征浓度为０．０１４ｍｇ／Ｌ（１％吸收），检出限为０．０３２ｍｇ／Ｌ（３），测定下限为０．１１ｍｇ／Ｌ，相对标准偏差（ＲＳＤ）为１．５％～１０％，样品加标准回收率在９１．４％－１０５％之间。     

Structural Elucidation of the Cu(II)- Streptomycin Complex. Indirect Estimation of Streptomycin by Atomic Absorption Spectroscopy

Abstract

The neutral [Cu(II) - streptomycin .4 H₂O] complex is prepared and characterized by elemental analysis, TGA, IR, electronic and ESR spectra. The bonding between Cu(II) and streptomycin is found to take place through a Cu-O bond. The indirect estimation of streptomycin sulfate by atomic absorption spectroscopy is affected by the addition of an excess of cupric ions in slightly alkaline medium; the unreacted copper is separated as insoluble carbonate. The concentration of streptomycin in its product with copper is then indirectly determined from a pre-drawn caliberation curve for standard copper sulfate solutions.     

Determination of Lead in Whole Blood and Urine Using Zeeman Effect Flameless Atomic Absorption Spectroscopy

Abstract

Lead is the most frequently quantitated toxic metal in biological matrices. We describe methodologies for lead determinations in whole blood and urine using Zeeman effect flameless atomic absorption spectroscopy. The whole blood determination requires a simple aqueous 1:10 dilution while the urine lead methodology utilizes a twofold dilution with 5% nitric acid. Within-run relative standard deviations (RSD) for the whole blood determination are approximately 4. 9%, while urine lead within-run PSD's are approximately 6.7%. Detection limits for both the whole blood lead determination and the urine lead determination are 3 ppb. Linearity for both assays is to 200 ppb in the diluted specimens.     

微量火焰原子吸收法测定水中铅

本文研究了高性能空心阴极灯－高效零化－单缝石英管系统这一微量火焰原子吸收技术在微量Ｐｂ测定方面的应用。在Ｐｂ的最灵敏线２１７．０ｎｍ处和次灵敏线２８３．３ｎｍ处考察了微量火焰原子吸收技术对噪音、灵敏度及检出限的改善程度。分别得到噪音改善２．０８倍、３．８６倍；提高灵敏度３２倍、９．９倍；信噪比改善倍数６７和３８的满意结果。选择Ｐｂ的最灵敏线２１７．０ｎｍ测定自来水及合成样品中的Ｐｂ，特征浓度可达６     

Highly Selective and Sensitive Preconcentration of Mercury Ion and Determination by Cold Vapor Atomic Absorption Spectroscopy

Abstract

A simple and selective method based on a sodium dodecyl sulfate (SDS)–coated chromosorb P modified by 2‐mercaptobenzoxazole (MBO) has been developed to selectively separate and concentrate ultra trace amounts of mercury(II) ions for its highly sensitive measurement by cold vapor atomic absorption spectrometry (CVAAS).

The mercury ions were adsorbed quantitatively on SDS‐coated chromosorb due to its complexation with MBO, while the retained Hg²⁺ ions were then stripped from the column with minimal amounts of 2 M nitric acid in acetone. The eluting solution was sent to CV‐AAS for evaluating Hg²⁺ ion content and results indicate that the calibration curve was linear for Hg²⁺ ion in the range of 0.05–85.6 ng mL^?1 and 0.09–9.6 µg mL^?1 of Hg²⁺ ions. Maximum capacity of the SDS‐coated chromosorb modified with 40 mg of the ligand was found to be 498±30 µg of mercury(II), the limit of detection was 0.01 ng mL^?1, and enrichment factors were about 300, which make it suitable it for dilute solution analysis. The method was successfully applied to the determination of Hg²⁺ ion content in real samples.     

Determination of Arsenic in Drinking Water by Graphite Furnace Atomic Absorption Spectroscopy. An Undergraduate Instrumental Analysis Laboratory

A laboratory exercise, the analysis of arsenic in drinking water by graphite furnace atomic absorption spectroscopy (GFAA), is presented for use in an undergraduate instrumental methods course. The purpose of this GFAA exercise is to expose students to a practical and commonly used application, to provide students with hands-on experience with the instrument, and to reinforce concepts taught in the classroom. Students safely analyze a real-world sample containing an analyte in the parts-per-billion concentration range.     

氢化物负压发生和真空无火焰原子化器的原子吸收光谱法测定铋

在负压发生器中用1% NaBH_4将Bi(Ⅲ)还原为铋化氢后,向发生器中加入一定量的空气。用真空泵将铋化氢和空气的混合物同时吸入到真空电热石英管中,用原子吸收仪器测定。在原子化器内,加入空气中的氧与硼氢化钠分解产生的氢反应,生成水分子。因而消除了氢对测定铋的干扰。     

Determination of Ultratrace Amounts of Copper（ Ⅱ ） in Water Samples by Electrothermal Atomic Absorption Spectrometry After Cloud Point Extraction

IntroductionIn environment, copper is usually found in traceor ultratrace levels, and its detection requires sensitiveinstrumental measuring techniques such as electrother-mal atomic absorption spectrometry(ETAAS) and ICP-AES or ICP-MS. Frequently, a prec…     

石墨炉原子吸收光谱法测定生活饮用水中砷的方法优化

建立了石墨炉原子吸收光谱(GFAAS)法测定生活饮用水中砷的方法。升压放电空心阴极灯的使用,降低了基线噪声水平和检出限。对温度程序、化学基体改进剂和热稳定剂进行了优化并用于GFAAS测定砷,无需进行初步处理。研究结果显示,线性方程为y=0.005 62x+0.000 04,相关系数R为0.998 3,样品体积为16μL时的检出限为0.26μg/L。加标回收率为98.1%～99.2%,相对标准偏差<5%。取实际饮用水样验证了其适用性。