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.     

Indirect Determination of Pyrrolizidine Alkaloids by Flame Atomic Absorption Spectrometry

Abstract

This paper studies the formation and extraction of ion pairs of some alkaloids derived from pyrrolizidine. The substances studied are Nemorensine, Platyphylline, Senecionine and Seneciphylline, and the ion pairs studied and extracted are formed with Bil₄. The method consists of extracting an ion pair between the organic base and the inorganic complex, the metal is measured in the organic phase (1,2 dichloroethane) by Flame AAS. The optimal experimental conditions, pH, concentration of BiI₄ ^?, shaking time, phase ratio, number of extractions, and the range of calibration are studied for these substances. The linear range in organic phase is 0.13–1.91 mg.mL^?1. The standard deviation of the method varies between 2.4–3.2%, depending on the substance analyzed. The interferences produced by various substances are studied.     

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.     

间接原子吸收法测定苯并三氮唑

乙酸钠介质中 ,加入过量的铜 (Ⅱ )与苯并三氮唑生成沉淀 ,用火焰原子吸收法测定上清液中剩余的铜(Ⅱ ) ,工作曲线法测定了工业合成样品及内燃机冷却水中的苯并三氮唑。该方法测定苯并三氮唑线性范围为1 2mg/L～ 30mg/L ,回收率 (n =5)为 98.9～ 1 0 1 .0 %。文中还测定了难溶化合物的溶解度、溶度积和化合物的组成比。     

Indirect Microdetermination of Hydroxide Ions by Atomic Absorption Spectrophotometry

Abstract

A simple indirect atomic absorption spectrophotometric method is described for the determination of hydroxide ions. The method is based on the reduction of silver ions which takes place when hydroxide sample is treated with silver (I) solution in presence of manganese(II) ions. The unconsumed silver is determined by atomic absorption spectrophotometry. The effects of a number of factors have been studied and the method was employed for the determination of free alkali in paper samples.     

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.     

The Determination of Yttrium in High Temperature Refractory Oxides by Atomic Absorption Spectroscopy

Abstract

A rapid method is described for determining yttrium in refractory zirconia using atomic absorption spectroscopy. The sample is fused with a mixture of LiBO₂ and H₃BO₃, and the melt is dissolved in hot dilute HClO₄. A flame buffer consisting of potassium and EDTA is employed to effect maximum absorbance. The compositions of the standard solutions are matched as closely as possible to the samples. The yttrium absorbance is measured at 410.2 nm using a stoichiometric NS₂O + C₂H₂ flame. Sulfate, phosphate, calcium, and magnesium do not interfere. Silica can be removed by fuming with HF before the fusion. Recovery studies show that the procedure is sufficiently accurate to be used for the routine determination of yttrium in samples containing from 2 to 18% Y₂O₃.     

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.     

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。     

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。     

Determination of Barium in Bottled Drinking Water by Graphite Furnace Atomic Absorption Spectrometry

Abstract

In relation to the wide environmental spread of barium and to its cardiovascular effects, barium levels were determined by graphite furnace atomic absorption spectrometry in 60 different brands of bottled water marketed in Italy.

Matrix interferences were investigated in order to evaluate the use of an analytical calibration function rather than the much more time consuming addition technique.

The barium content ranged from limit of detection C_L (7.0 μg/l) up to 660 μg/l, the median value being 80 μg/l, while the recovery tests varied between 90 and 110 % and the precision of the method (s_yx) was 2.5 %.     

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。     

Indirect Atomic Absorption Spectrometric Determination of Ammonia,Thiosulfate and Cyanide in an Unsegmented Flow System

Abstract

A flow injection analysis method (FIA), has been developed for the determination of cyanide, thiosulfate and ammonia by atomic absorption spectrometry (AAS). Aqueous solution of the analyte was injected into an on-line column containing glass beads and packed with silver chloride and deionized water was used as the carrier. The analyte dissolves the silver chloride and the dissolved silver complex is introduced to the nebulizer of the AAS. This method has proved to be sensitive, simple and precise. Detection limits of 1.0 × 10^?7 M, 5.0×10^?7 M and 5.0x10^?6M were obtained for thiosulfate, cyanide and ammonia, respectively. The precision of the technique was 2.0%, 2.4% and 1.4% in case of thiosulfate, cyanide and ammonia, respectively. The effects of flow rate and sample volume on the FIA/AAS signals are presented.     

松口蘑中微量元素的测定

采用火焰原子吸收法同时测定了松口蘑中K、Ca、Na、Mg、Fe、Pb、Cd、Co、Cr、Zn、Mn、Cu等12种元素的含量。方法的相对标准偏差在0.08％－2.32％范围,回收率在97.1%－108.3%范围。结果表明,在三种松口蘑样品中,除含有较高的K、Na、Ca、Mg和一定量的有害元素Cd、Pb外,其余6种对人体有益的微量元素较为丰富。     

原子发射光谱法间接测定黄连素片剂中盐酸小檗碱的研究

本文提出了离子对-原子发射光谱间接测定黄连素片剂中盐酸小檗碱的新方法。发现用1,2-二氯乙烷作萃取剂效果最佳。用此怯测定实际样品的结果与药典法一致,相对误差为0.61％,单一测定的相对标准偏差为0.67％。本法还可在盐酸普鲁卡因共存下单独测定盐酸小檗碱。方法可靠、适用,选择性较好。     

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％。