Extraction-spectrophotometric determination of tungsten with thiocyanate and some amidines |
| |
Authors: | A Shukla KS Patel RK Mishra |
| |
Institution: | Department of Chemistry, Ravishankar University, Raipur-492 010, M.P. India |
| |
Abstract: | The procedure is based on reduction of W(VI) to W(V) by tin(II) chloride in 6 M hydrochloric acid, and extraction of the resultant thiocyanate complexes with a benzene solution of amidine. The complex coagulates and is dissolved in the benzene by addition of 1-pentanol. The maximum molar absorptivities of the complexes with 8 amidines in benzene/1-pentanol (9:1, v/v) are in the range 12 100–18 400 mol?1 cm?1. The simplest compound, N,N-diphenylbenzamidine gives the best sensitivity; the linear range covers 5–90 μg W in 10 ml of final solution; the detection limit is 2 ng W ml?1. The method is applied to alloy steels. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|