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- W2348481942 abstract "A new chromogenic reagent, namely 2-(2-quinolylazo)-1,5-diaminobenzene (QADAB) was synthesized and its molecular structure was identified by methods of elementary analysis, IR-spectroscopy, NMR and MS. It was found that in a phosphate buffer medium of pH 3.5 and in the presence of CTMAB, QADAB reacts with Co(Ⅱ) ion to form a stable coordination complex with the mole ratio (R∶Co) of 2 to 1. The Co-QADAB complex in 50ml of solution was concentrated on a C_(18) solid-phase extraction column by passing the solution through the column at a flow-rate of 10ml·min~(-1). The solution in the column was removed by suction. The Co-QADAB complex was then eluted with 2.5ml of ethanol, which contains 2% (by volume) of acetic acid. The eluate was transfered to a micro absorption cell of 1cm in light-path and of a volume of 0.5ml. Its absorbance was measured at its λ_(max) 590nm, with reagent blank as reference solution. Beer′s law holds in the range of 0.01～0.80mg of Co(Ⅱ) per liter of solution, with a molar absorptivity of 8.36×10~4L·mol~(-1)·cm~(-1) at 590nm. This method has been applied to the analysis of environmental samples. RSD′s found were less than 3%. Recoveries were found in the range from 96%～105%. Results obtained by this method checked quite well with those obtained by AAS method." @default.
- W2348481942 created "2016-06-24" @default.
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- W2348481942 date "2004-01-01" @default.
- W2348481942 modified "2023-09-27" @default.
- W2348481942 title "CHROMOGENIC REACTION OF COBALT(II) WITH 2-(2-QUINOLYLAZO)-1,5-DIAMINOBENZENE AND ITS SOLID-PHASE EXTRACTION AND PHOTOMETRY" @default.
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