发明名称 |
Verfahren und Mittel zur Bestimmung von Gesamthärte |
摘要 |
The invention relates to a dry chemical method and a test strip for determining calcium and magnesium in aqueous samples. Said test strip contains o-cresolphthalein complex (o-CPC; CAS Registry No. 2411-89-4) as a colour-causing reagent in a buffer system with a pH value of below 8.5. By using in particular an aqueous ethanolic imidazole buffer with a pH value of 6.75, conditions can be set up in such a way that the o-CPC has an identical molar sensitivity with respect to Ca and Mg. The total water hardness of aqueous samples can thus be easily determined.
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申请公布号 |
DE10061140(A1) |
申请公布日期 |
2002.06.13 |
申请号 |
DE20001061140 |
申请日期 |
2000.12.08 |
申请人 |
MERCK PATENT GMBH |
发明人 |
KRENN, KARL-DIETER;TANZER, DIETER |
分类号 |
G01N31/00;G01N21/77;G01N21/78;G01N31/22;G01N33/18;(IPC1-7):G01N31/22 |
主分类号 |
G01N31/00 |
代理机构 |
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主权项 |
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地址 |
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