CYANOGEN CONCENTRATION MEASURING METHOD

PROBLEM TO BE SOLVED: To improve a simple cyanogen concentration measuring method in extensively employed current practice using picric acid reagent to obtain measurements at a higher level of accuracy while maintaining the cost saving advantage over the officially prescribed method.SOLUTION: A cyan...

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Hauptverfasser:	SEO SHOJI, FUJISAWA SO, KONO MAIKO, KAWAI TATSUJI, KAWABATA JUNICHI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING PHYSICS TESTING
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Zusammenfassung:	PROBLEM TO BE SOLVED: To improve a simple cyanogen concentration measuring method in extensively employed current practice using picric acid reagent to obtain measurements at a higher level of accuracy while maintaining the cost saving advantage over the officially prescribed method.SOLUTION: A cyanogen concentration measuring method comprises: a step ST1 of adding a masking agent to sample water; a step ST2 of separating and recovering free cyanide by distilling the sample water to which the masking agent is already added; a step ST3 of forming a colored chemical compound by bringing the free cyanide into contact with potassium picrate, which is an assay reagent; and a step ST4 of figuring out the cyanogen concentration of the sample water from the absorbance of the colored chemical compound. The masking agent is a mixture of copper sulfate and stannous chloride. 【課題】従来広く採用されているピクリン酸試薬を用いた簡易的なシアン測定方法について、公定方法に対するコスト低減のメリットを維持したまま、より精度の高い測定値を得ることができる、シアン濃度測定方法を提供すること。【解決手段】シアン濃度測定方法であって、試料水にマスキング剤を添加する工程ＳＴ１と、マスキング剤の添加後の試料水を蒸留して遊離シアンを分離回収する工程ＳＴ２と、遊離シアンを、検定試薬であるピクリン酸カリウムと接触させて有色化合物を形成する工程ＳＴ３と、有色化合物の吸光度から、試料水のシアン濃度を算出する工程ＳＴ４と、を備え、マスキング剤は、硫酸銅と、塩化スズとの混合物であるシアン濃度測定方法とする。【選択図】図１