Determination of Trace Germanium in Marine Sediments by Hydride Generation-Atomic Fluorescence Spectrometry (HG-AFS)

A method for the analysis of trace germanium in marine sediments by HG-AFS has been investigated. The experimental conditions such as the acidity of reduction reaction, the amount of sodium boro-hydride, the carrier gas flow rate, etc., were tested and optimized by using a kind of orthogonal design. The detection limit of the presented method is 0.95 μg L -1 for germanium. The calibration curve shows a satisfactory line in the concentration range 0-320 μg L -1 Ge with a variation coefficient of ±2.1%.

Determination of Selenium in Marine Aquatic Products by Hydride Generation-atomic Fluorescence Spectrometry (HG-AFS)

A method for the analysis of selenium in marine aquatic products by HG-AFS has been investigated. The method is based on the reduction of inorganic selenium to volatile SeH2 which is bubbled out by carrier gas of pure argon, and then swept to Ar-H2 flame quarts atomizer to measure its fluorescence intensity. The hydride generation, transportation, atomization and some instrumental parameters were studied by a kind of orthogonal design. The optimum conditions selected are as follows： reactive acidity, 20% HC1; the amount of NaBH4, 4.9mL; gas flow of argon, 600mLmin^-1; atomizing temperature, 200 ℃ ; negative high voltage, - 300V; light current, 100 mA; integral time, 7s. The detection limit of the presented method is 0.072μgL^-1 for selenium. The calibration curve shows a satisfactory line inthe concentration range from 0.000 to 1.000μgL^-1 Se. The recovery is 95.8%-102.2%.

Microwave Digestion Sample Hydride Generation-Atomic Fluorescence Spectrometry Determines Trace Selenium of Mogroside

0.2000g mogroside sample is digested by 7.0ml nitric acid and 3.0ml hydrogen peroxide, and generated by coprecipitation enrichment hydride - atomic fluorescence spectrometry determines trace selenium in it. Under optimum experiment conditions, a standard curve was produced using selenium standard solution, the linear equation is Ise=2890.6c＋0.0012,compared wish the linear relaticnship is not by coprecipitation direct determination of standard series Ise=82.56c＋0.0018 Selenium detection sensitivity was increased by 35.01 times,the correlation coefficient of obtained linear regression equation is 0.9996, the detection limit is 0.0012~tg/L and the relative standard deviation is 0.76% （n=5）. Containing 0.1808pg.g-1 Se Luo Han Shen samples. Based on mogroside sample, add a certain of standard solution to do recovery experiment, the obtained recovery rate is in 95.8%-103.6% and the result is satisfactory.

氢化物-原子荧光法测定磷矿石中的微量铅

采用氢化物发生原子荧光光谱法测定磷矿石中微量铅,研究了仪器工作条件、溶样介质、温度、酸度等对测定的影响以及Fe,Mg,Al,Ca等元素的干扰,加标回收率在91.2%～110.8%,获得了满意的结果。

趾甲砷氢化物发生——原子荧光测定方法探讨

目的建立一种灵敏度高、准确可靠、实用的趾甲含砷量的分析方法，为地方性砷中毒防治提供实验室检测依据。方法样品用2％的中性洗涤剂，温水浸泡30min清水洗净，用硝酸-高氯酸（2：1）3ml消化0．2g趾甲样。应用氢化物发生——原子荧光法（HG—AFS）测定趾甲砷。结果本方法的线性范围为0-100μg／L，相关系数≥0．9995，取样量为0．2g时，检出限为0．0243μg／g；该方法精密度较高，相对标准偏差（RSD）〈10％；加标回收率在90％以上。结论该方法灵敏、准确可靠，操作较简单、快速，适用于地方性砷中毒病区趾甲砷的测定分析。

氢化物发生原子荧光光谱法测定钢铁及合金材料中痕量铋

采用氢化物发生原子荧光光谱法 ,研究了用硫代氨基脲—抗坏血酸及磷酸作干扰抑制剂消除大量基体元素干扰 ,提出了钢铁及合金材料中痕量铋的分析方法。方法的检出限为Bi=0 0 2 μg·g-1( 3δ ,n =11,0 2 0 0 0 g试样 )。用该方法分析了中低合金钢 ,铁镍基、镍基、钴基高温合金 ,铜合金等样品 ,获得了满意的结果。

Synthesis of a Novel Imidazole Ionic Liquid Modified Mesoporous Silica SBA15 for Selective Separation and Determination of Inorganic Arsenic in Rice

A novel 1-methylimidazole ionic liquid modified SBA15 mesoporous silica(1-MIIL@SBA15) was synthesized and applied to selective separation of inorganic arsenic(iAs) in rice by dispersive solid phase extraction(DSPE), followed by hydride generation-atomic fluorescence spectrometric(HG-AFS) quantification. The prepared sorbent was characterized by FTIR, FESEM, BET and Zeta potential. Key parameters of adsorption and desorption in DSPE were optimized using standard reference material 1568 b rice flour. Under optimal conditions, the limit of detection was 8.776 ng/kg, relative standard deviation was ≤2.0%, and recoveries of iAs were in the 92.3～94.4% range. This method was successfully applied to the determination of iAs in rice. Under acidic condition, the electrostatic interaction between the positively charged 1-MIIL@SBA15 and anionic iAs played an important role in selective iAs separation, rendering this method suitable for iAs analysis.

氢化物原子荧光法测定水中砷

[目的]应用氢化物原子荧光法测定水中砷含量的方法。[方法]样品处理后以氢化物原子荧光法测定。[结果]本方法检出限为1．0μg／L，在0～20．0μg／L范围内，线性关系良好，r=0．9996，回收率98．3％～100．2％。[结论]本法操作简便、快速，适合测定水中砷。