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《Physical Testing and Chemical Analysis Partb Chemical Analgsis》 1999-04
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FILTER PAPER LOADING-SOLID PHASE REFLECTIVE-DIFFUSION SPECTROPHO-TOMETRIC DETERMINATION OF SILVER IN GEOLOGICAL SAMPLES

Zhao Zhongyi, Song Chunrong, Jin Jihong, Su Xunzhi(Dept. of Applied Chemistry, China University of Geosciences, Wuhan 430074)  
In an acidic medium, silver (I) reacts with p-dimethylaminobenzylidenerhodanine forming a stable complex which in the presence of appropriate amount of anionic surfactant can be filtered and spreaded evenly on a filter paper of definite diameter. Based on this phenomenon, a solid-phase reflective-diffusion spectropho tometric method for the determination of silver is developed. The reflective absorption is determined at the wavelength of 595nm. The limit of detection of the method is 0. 05μg ·ml~(-1) and its RSD is 3.0%. The proposed method has been applied to the analysis of geological samples with satisfactory results.
【CateGory Index】: O657.3
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