過酸化水素を用いた定着液中の銀定量法

概要

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We devised a new conventional determination method for silver in an used fixer using 30% hydrogen peroxide (H_2.O_2). This method is very practical, because it is treatable in a short time and can detect silver to the order of 1g/l. When H_2O_2 is added to the fixer, the exothermic reaction occurs, and the mixture of Ag_2S and AgBr precipitates immediately. This reaction is a competitive one and the product ratio of Ag_2S/AgBr depends on the addition speed of H_2O_2. When H_2O_2 is rapidly added to the fixer, and if both quantities are same, the weight ratio of Ag_2S to AgBr becomes almost constant at 1:9, where the fixer contains silver of over 3.5 g/l. Therefore, the silver content of the fixer can be determined as follows : l) Add 10 ml of H,O, rapidly to 10 ml of the fixer. 2) Measure the weight of reaction products which are filtered off, washed with distilled water and dried. 3) Determine silver by assuming 60% of the silver compound by weight to be silver. The weight difference of silver was within ±5% using this method from the authentic sample. The silver content of the fixer can be obtained roughly by the combined use of a silver compound mass and commercialized silver testing paper.
公益社団法人日本放射線技術学会の論文
1986-05-01