| 摘要 |
1374509 Metal ion detection MERCK PATENT GmbH 24 Nov 1972 [15 Dec 1971] 54451/72 Heading G1B An indicator for the detection of metal ions comprises an absorbent carrier and absorbed therein an alkali metal salt of dithizone. In examples filter paper is impregnated with mixtures of dithizone, sodium acetate, sodium carbonate or potassium carbonate, thiourea, and gelatine, polyvinyl alcohol or hydroxypropyl cellulose. A colour reaction is given with zinc, silver, cadmium, mercury, lead, thallium, copper, nickel or cobalt. |
