发明名称 |
METHOD AND DEVICE FOR THE CONTINUOUS COLORIMETRIC DETERMINATION OF THE CONCENTRATION OF CYANIDE IN AQUEOUS SOLUTIONS |
摘要 |
<p>According to the invention, cyanide concentrations of approximately 0.001 to 5 mg cyanide/1 are colorimetrically determined in a continuous manner by means of the known cyanidepicric acid color reaction. The solution containing free cyanide and/or cyanide releasable from cyanocomplexes is converted in a system enclosed in a gas-tight manner in the presence of chelate complexing agents, picric acid and alkaline buffer systems in 1-60 minutes at 50 DEG -120 DEG C. to the color complex and the absorbency is measured spectrophotometrically. The method avoids the extraction step which was previously necessary under 0.2 mg CN/1, avoids errors due to HCN gas evolution losses, is easy to manage, not prone to trouble and suitable for the continuous monitoring of waste-water streams or for controlling cyanide detoxification methods.</p> |
申请公布号 |
EP0269834(B1) |
申请公布日期 |
1991.09.11 |
申请号 |
EP19870115540 |
申请日期 |
1987.10.23 |
申请人 |
DEGUSSA AKTIENGESELLSCHAFT |
发明人 |
BILGER, EDGAR, DR.;WOLF, HUBERT |
分类号 |
G01N31/00;G01N21/78;G01N31/22;G01N33/18;G01N35/08 |
主分类号 |
G01N31/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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