Determination of Hg in soil by ultrasonic slurry sampling hydride generation atomic fluorescence spectrometry

Ultrasonic aided slurry sampling hydride generation atomic fluorescence spectrometry （USS-HG-AFS） was developed for the determination of Hg in soil samples from a sewage-irrigated farm. 500 mg grounded soil was suspended in agar solution by an ultrasound water bath before the HG-AFS determination. The results for the reference material of soil （serial number GBW-07411） agreed satisfactorily with the certified values. Results obtained by the developed procedure compared well with those after traditional acid digestion of samples. The detection limit are 6.7ngL-1 for Hg respectively, with average relative standard deviation values of 6.4% for analysis of a series of soil samples of different origin. The recoveries of the anatytes varied in the range from 95 to 107%. This observation has stimulated interest in fast, accurate and sensitive analytical methods for determination of metals in soil.

Determination of Cadmium in TSP, PM10 in urban areas by hydride generation atomic fluorescence spectrometry

In this paper, two different diameter particles （TSP, PM10） were collected by TH-16A four-channels classification air sampler. The samples were treated by HNO3. Analysis of cadmium was carried out by hydride generation atomic fluorescence spectrometry （HG-AFS） method, and distribution proportions of elements in four phases were calculated. This method was based on the reaction of cadmium with 1.5% （m/v） KBH4 solution and 0.5% KOH（m/v） solution to form the hydride gas in medium of 2% （v/v） HCl. The detection limit for cadmium as low as 0.008μg/L was obtained. The lineally correlation coefficient was 0.99992. The relative standard deviation （n=5, C=1.00μg/L） was 3.26%. The proposed method was applied for the determination of cadmium in atmosphere aerosol samples and the recoveries in the range of 95-102.2% were obtained. This method was simple, rapid, less matrix interference and high sensitivity.

黄皮叶中5种重金属元素的含量测定

黄皮叶药材经硝酸－高氯酸（10＋2）湿法消解后，采用原子吸收分光光度法测定铜元素含量，采用原子荧光法测定砷、汞、铅、镉元素的含量，建立了黄皮叶药材中5种重金属元素的含量测定方法，并测定了不同产地及批次黄皮叶药材中这5种元素的含量。5种元素回收率在94．25％～104．1％之间，8批黄皮叶中铜、砷和铅元素含量均低于国家限量标准，部分产地和批次药材中的重金属汞、镉元素含量高于国家限量标准。

Study on tissue distribution of a novel organoselenium antitumor compound WBSELEN

A novel organoselenium compound,WB（1,2-[bis（1,2-benzisoselenazolone-3（2H）-ketone）]pentane） has indicated anti-tumor activity.Its pharmacokinetic data has never been determined.By using the H22 tumor bearing mouse model,the tissue distribution of WB after single and four consecutive doses（both were 120 mg/kg/d） was explored.The selenium content of the tissues was used as an indicator of WB absorption,distribution and metabolism.The selenium in the heart,liver, spleen,kidneys,lungs,stomach,pancreas,brain,colon,intestine,testes,plasma,and tumor were determined by generation atomic fluorescence spectrometry（AFS）.With single or multiple oral administration of WB,the selenium content significantly increased in the liver,stomach,colon,and intestine.The selenium content in the spleen,lungs,pancreas,testes,plasma and tumor also increased compared with the controls;but no significant changes were found in the brain and kidney.WB and its metabolites distributed predominantly in the colon,liver,stomach and intestine,which resulted in a significant increase in the selenium content in both groups.There was no observed significant accumulation of WB in the vital organs.

Selenium speciation in flue desulfurization residues

Flue gas from coal combustion contains significant amounts of volatile selenium （Se）. The capture of Se in the flue gas desulfurization （FGD） scrubber unit has resulted in a generation of metal-laden residues. It is important to determine Se speciation to understand the environmental impact of its disposal. A simple method has been developed for selective inorganic Se（IV）, Se（VI） and organic Se determination in the liquid-phase FGD residues by hydride generation atomic fluorescence spectrometry （AFS）. It has been determined that Se（IV）, Se（VI） and organic Se can be accurately determined with detection limits （DL） of 0.05, 0.06 and 0.06 μg/L, respectively. The accuracy of the proposed method was evaluated by analyzing the certified reference material, NIST CRM 1632c, and also by analyzing spiked tap-water samples. Analysis indicates that the concentration of Se is high in FGD liquid residues and primarily exists in a reduced state as selenite （Se（IV））. The toxicity of Se（IV） is the strongest of all Se species. Flue gas desulfurization residues pose a serious environmental risk.