Indirect Determination of the Pesticide Malathion by Atomic Absorption Spectrophotometry

Abstract

A method for the indirect determination of the pesticide malathion by atomic absorption spectrophotometry (AAS) is proposed and compared with the standard spectrophotometric method.

A study of the influence of the different variables on the hydrolysis and extraction is carried out in order to obtain the best experimental conditions.

The proposed method offers clear advantages over the standard procedure because of the instability of the Cu (II) complex formed. Both methods are applied to the determination of malathion in two commercial formulations.     

Indirect Determination of Lidocaine by Atomic Absorption Spectrophotometry

Abstract

A new procedure for determining lidocaine chlorhydrate is described. The method consists of extracting an ion pair composed of Lidocaine and the inorganic complex Co(SCN)₄ ^2- into an organic solvent (1, 2 dichloroethane), then measure the Co in the organic phase by A.A.S. at 240.7 mm. Optimal experimental conditions concerning pH, Co(SCN)₄ ^?2 concentration, shaking time, phase ratio, number of extractions and linear range for calibration are studied. The method has a standard deviation of 10^?2. Two pharmaceutical preparations containing lidocaine, have been analyzed with very good results.     

Indirect Determination of Sulfide by Cold Vapor Atomic Absorption Spectrometry

A method for the determination of sulfide based on its interference with the determination of Hg by cold vapor atomic absorption spectrometry is described. The decrease in mercury absorbance at 253.7nm is proportional to the concentration of sulfide over the range of 10–320ngmL^–1. The limit of detection was found to be 7ngmL^–1 and the relative standard deviation (R.S.D.) for the determination of different concentrations of sulfide was in the range of 1.8–2.2%. This method was applied to the determination of sulfide in whole human blood after gas-phase separation.     

Indirect Determination of Bromhexine by Atomic Absorption Spectrophotometry

Abstract

A new procedure for determination of Bromohexine is described. The method consists of extracting an ion pair between the Bromhexine and the inorganic complex Co(SCN)² ₄ and measuring Co in the organic phase by AAS at 240. 7 nm. The optimal experimental conditions: pH, concentration of Co(SCN)² ₄, shaking time, phase ratio, number of extractions and the linear range of calibration are studied.

The organic phase used is 1,2-dichloroethane. The standard deviation of the method is 10^?3. The interference of foreign substances which accompany the Bromhexine in pharmaceutical preparations is studied, and the method is applied to their quantitative determination in medicines.     

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。     

An Indirect Determination of Some Ions by Flameless Atomic Absorption Using a Wire Loop Atomizer

Abstract

In previous studies using a wire loop atomizer with a preconcentrating soaking step it has been reported that there are sometimes interferences due to other species in the sample besides the metal of interest. It is possible to use this interference to advantage as an indirect method for some anions and metals that are determined only with poor sensitivity by atomic absorption spectroscopy. Cyanide, lanthanum, and zirconium were studied to determine if useful calibration curves and low detection limits could be obtained by this indirect method.     

间接原子吸收分光光度法测定锆

研究了空气－乙炔火焰原子吸收光谱法间接测定微量锆的方法,在弱酸性溶液中钢与Ｎ－亚硝基苯胲（铜铁试剂）形成１：２络合物可被氯仿定量萃取,Ｚ ｒ（Ⅳ）定量置换Ｎ－亚硝基苯胲钢中的铜,原子吸收光谱法测铜间接测锆,特征浓度为 ０．０７ × １０－６ ｇ／ｍＬ／１％,线性范围为 ０～５ｍｇ／Ｌ,方法简便、快速、灵敏度高,选择性好,用于瓷釉和α－βＡｌ２Ｏ３中氧化锆的测定,结果满意。     

原子吸收分光光度法在有机分析中的应用

本文将各种用于有机化合物分析的ＡＡＳ方法按其所用的化学反应分为七类，并按类介绍和评述了ＡＡＳ在有机分析中的部分重要工作和近期发展，就间接ＡＡＳ的优缺点、主要研究内容和新技术的应用做了探讨。     

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。     

原子吸收光谱法间接测定钢铁中铌

在研究铌对原子吸收光谱法测定镍的干扰效应基础上，建立了间接测定钢铁中铌的分析方法，该法测定铌的特征浓度为０．００１２μｇ／ｍｌ／１％，直线浓度范围为０－２．０μｇ／ｍｌ，钢铁标样分析表明该法准确度，精度度均好，本文通过Ｘ射线分析及镍原子在火焰中的分布规律研究，对铌的增感机理也进行了探讨。     

间接原子吸收光谱法测定啤酒中痕量硫化物的研究

用Ｃｄ＾２＋沉淀啤酒中的痕量硫化物,再以十二烷基苯磺酸钠泡沫浮选富集ＣｄＳ、用火焰原子吸收光谱法测定ＣｄＳ中的镉,从而测定啤酒中硫化物的含量。对沉淀浮选及ＡＡＳ法的条件和方法进行了研究。该方法灵敏度高,选择性和重现性均较好。能成功地测定啤酒中痕量硫化物。     

The Determination Of Thallium In Human Hair By Graphite Furnace Atomic Absorption Spectrophotometry

Abstract

An atomic absorption spectrophotometric procedure is des-scribed for the rapid determination of thallium in human hair. Samples of 500 μg are dissolved in nitric acid and treated with hydrogen peroxide. Aliquots of 10 μL are then analyzed using electrothermal atomization in a graphite tube furnace. The characteristic concentration for the method is 1 mg Tl kg^?1 which is adequate for forensic investigation. The relative standard deviation for a series of signals from a hair sample spiked to contain 32 mg Tl^?1 kg was 3 per cent.     

Atomic Absorption Spectrophotometric Investigation and Determination of Palladium

This work aims to achieve a determinate characterization of compound formation and to find out the resolution to overcome chemical interferences in atomic absorption spectrophotometric (AAS) determination of palladium. The effect of flame composition in producing a neutral palladium atoms was investigated. A new analytical procedure has been elaborated for the determination of palladium.     

原子吸收光谱法测定香烟烟气中重金属的含量

用原子吸收、荧光光谱法测定了不同品种香烟烟气的水吸收液中铅(Pb)、镉(Cd)、铬(Cr)、汞(Hg)的含量,并用等离子体发射光谱法进行比较测定。结果表明,原子吸收光谱法具有灵敏度高、干扰小、快捷的优点。方法回收率为98%～100%,相对标准偏差小于5.0%。实际样品测定结果令人满意。     

有机硅化合物中硅的原子吸收分光光度法测定

本文提供了一个简便、快速测定有机硅化合物中硅的方法。用氧瓶法分解试样(2-3 mg),用氢氧化钠和过氧化氢溶液为吸收液。样品溶解后,置于90℃水浴上加热半小时。冷却后,选择最佳原子化条件,用氧化亚氮/乙炔焰,采用标准加入法测定之。实验结果表明,对标准硅酸钠(Na_2SiO_3·9H_2O)中硅的测定,回收率为98.00～102.5％。吸收液氢氧化钠浓度为3N和6N时,对硅的定量测定均无影响,测定样品的相对误差<0.5％。     

Indirect Determination of Cyanide by Atomic Absorption Spectrometry

Abstract

Two methods for determination of cyanide by atomic absorption spectrometry (AAS) are developed. Both methods are based on the formation of an ion association compound between a metal complex, (Ag(CN)₂ ^? or Cu(CN)₃ ^2-), and a quaternary ammonium ion (benzyldimethylhexadecylammonium ion). The ion association compound is extracted into isomethylbutylketone (IBMK) and the metal is determined by AAS directly in extract. The method based on the formation of silver cyanide complex provides a reproducibility of 2.5%, a recovery of 99% and a detection limit of 1.7 μg/L while the method based on the formation of copper complex gives a reproducibility of 6%, a recovery of 93% and a detection limit of 0.6 μg/L. Several foreign ions were studied: the method based on the formation of Ag(CN)₂ ^? presents minor interferences.     

原子吸收光谱法测定水中微量PEO非离子型表面活性剂的研究

叙述了原子吸收光谱法间接测定水中微量非离子型表面活性剂的分析原理、条件和方法。该法主要是根据聚氧乙烯（ＰＥＯ）型表面活性剂能与钡盐和磷钼酸铵定量生成络盐沉淀，且络盐中Ｍｏ与ＰＥＯ有较大的摩尔比，因而在试样的萃取液中沉淀表面活性剂，然后通过原子吸收光谱法测定沉淀中Ｍｏ的含量，能间接测定表面活性剂含量。回收实验表明，该法灵敏度、选择性和重现性均较好，适宜测定水中微量非离子型表面活性剂。     

Indirect Determination of Sulfate by Atomic Absorption Spectrophotometry

With a flow injection technique, the content of sulfate in solution was determined indirectly from the concentration of partially equilibrated barium ion in solution. To obtain improved sensitivity, atomic absorption spectrophotometry of a flame was used to determine barium. With these procedures combined with a linear calibration graph, superior sensitivity and detection limit of sulfate determination were obtained compared with those from other indirect methods.     

微量进样—火焰原子吸收法连续测定牧草样品中微量元素的研究

采用微量增样－火焰原子吸收法连续测定了牧草样品中微量元素铁、锰、锌、铜、钼和钴。实验表明，该法具有灵敏度、精密度高，选择性好，试剂消耗量小，快速、经济等优点。本法测定微量元素铁、锰、锌、铜、钼和钴的回收率均在９１．５％～１０４．６％之间，变异系数均小于４．１％。