[Research on the determination method of trace amount of Pb and Cd in animal bone]

A method for the determination of trace amount of Pb and Cd in animal bone using GFAAS has been established. The samples were determined directly after being diluted by TMAH solution. The method is handy and fast. The recovery is 96.95-103.15%. The RSD is less than 4.81%.

[Determination of molybdenum in natural waters by direct current plasma atomic emission spectrometry with ion-exchange preconcentration]

A new method was developed for the determination of trace molybdenum in natural waters by direct current plasma atomic emission spectrometry after separating and preconcentrating with D301 anion exchange resin. Mo adsorbed on the resin column can be recovered quantitatively by using 20mL of 8mol/L HNO3 at a flow rate of 0.6mL/min with elution rate of (81.6 +/- 1.78)%. The behaviour of Mo on the resin has been discussed. Simulative water and natural water samples have been determined. It was found that the interference element Ca could be separated effectively from Mo; an enrichment factor of 50 was obtained for Mo in 1L water sample; the determination limit of Mo was improved to 0.5 microg/L and the recovery of 90-107% was obtained.

[Simultaneous determination of 16 elements in decoction solution of Chinese herbal medicine by ICP-AES]

A new method has been developed for simultaneous derermination of 16 elements in decoction solution of Chinese herbal medicine by ICP-AES after pretreatrment the solution with HNO3-H2O2. This method has low and stable blank value. The detection limits of 0.1-5ng/ml for most elements and recoveries of 85-103% were obtained. This method has been applied to the determination of 16 elements in decoction solution of chinese herbal medicine with satisfactory reswls.

[ICP-AES method for the determination of migrated hazard elements in toy materials and coatings]

An ICP-AES method is established for the determination of Sb, As, Ba, Cd, Cr, Pb, Hg and Se in toy materials and coatings under conditions that simulate the situation where the materials stay 4 hours in alimentary tract after swallowing.

[Study on the direct determination of Pb and Cd in milk powder by GFAAS]

The paper reports the direct determination of Pb and Cd in milk powder by GFAAS. The mothed does not need any pre-treatment to the samples and fully use some function of pre-treatment which the Graphite Furnace have. The result indicates that the method is simple, rapid and accurate, and the false result from any pre-treatment to the samples can be reduced. The recover rate of Pb is 100.1%, CV =2.7 ; and Cd is 98.6%, CV = 3.1 %. This method is also applied to the rapid determination of Pb and Cd in soluble samples with satisfactory results.

[Extraction-flame atom absorption determination of trace copper, zinc, cadmium and iron in bones]

Trace content of Cu, Zn, Cd and Fe in bones is determined by flame atomic absorption spectrometry after preceding preconcentration using the extraction system O-phenanthroline-sodium perchlorate/1, 2-dichloroethane. Also, the factors of influence were studied. The method was simple, accurate and reliable, The detection limits were Cu: 0.038microg/ml, Zn: 0.0042microg/ml, Cd: 0.0019microg/ml, Fe: 0.02microg/ml. The recovery rate was between 92.8 and 105%.

[Determination of the trace silver by FAAS after separation and preconcentration with cotton cellulose xanthate]

Silver was absorbed by cotton cellulose xanthate in solution at pH 6, and was eluated quantitatirely from CCX with 3% HNO3 solution and determination by FAAS. The method is simple and rapid and has been apllied to the determination of silver in rocks and water.