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钢矿石中铜的碘量法快速测定中,为消除铁的干扰,通常采用氟化物六偏磷酸钠和聚磷酸盐等掩蔽铁,最近亦有采用锌～EDTA和焦磷酸钠来掩蔽铁的。氟化物是对铁比较理想的掩蔽剂,但系毒性物品,有污染江河之害。六偏磷酸钠和聚磷酸盐对含钙镁较高的铜矿石易生成胶粘状沉淀,对碘化亚铜有一定的吸附作用,易造成滴定终点的返回。锌～EDTA在掩蔽铁时用量十分严格,否则将掩蔽铜,因此增加了操作程序。焦磷酸
In the rapid determination of copper iodide in steel ores, iron is often used to mask the iron in order to eliminate the interference of iron. Recently, some iron has been concealed by zinc EDTA and sodium pyrophosphate. Fluoride is an ideal masking agent for iron, but it is a toxic substance that causes pollution of rivers. Sodium hexametaphosphate and polyphosphate on the calcium and magnesium high copper ore prone to sticky precipitate, copper iodide has some adsorption, can easily lead to the end of titration return. Zinc ~ EDTA in the masking of iron consumption is very strict, otherwise it will mask the copper, thus increasing the operating procedures. Pyrophosphate