BS ISO 7766-2003 摄影冲洗废液.氰化物分析.用光谱法测定六氰基高铁酸盐(Ⅱ)和六氰基高铁酸盐(Ⅲ)

标准号：BS ISO 7766-2003
中文标准名称：摄影冲洗废液.氰化物分析.用光谱法测定六氰基高铁酸盐(Ⅱ)和六氰基高铁酸盐(Ⅲ)
英文标准名称：Processing photographic wastes - Analysis of cyanides - Determination of hexacyanoferrate(II) and hexacyanoferrate(III) by spectrometry
标准类型：G84
发布日期：2003/6/30 12:00:00
实施日期：2003/6/30 12:00:00
中国标准分类号：G84
国际标准分类号：13.030.30;37.040.30
适用范围：This International Standard establishes a test method for the determination of hexacyanoferrate (II) (ferrocyanide) and hexacyanoferrate (III) (ferricyanide), referred to hereafter as Fe (CN)6, in photographic processing effluents. Results are reported as hexacyanoferrate, Fe (CN)6. note: 1) Significant levels of thiosulfate (hypo) can result in interference. Significant levels of thiosulfate in processing-machine effluents result in oxidation of the thiosulfate by iron (III). Sulfur will form, increasing the spectrophotometric absorbance which is measured. Also, thiosulfate may deplete the added iron (III) leaving nothing for the colour reaction. The method is applicable to effluents from buildings where the thiosulfate would be diluted by the rest of the building wastes and this would eliminate the interference.