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络合滴定测定铝最主要的干扰元素为锰、锡、钛等,为此曾推荐过用硝酸-氯酸钾或苯甲酸铵分离锰。对于钦的掩蔽剂,资料曾列举了近20种,但都不够理想。资料以苯甲酸铵预先分离,继用强碱进行铝、钛分离,流程繁杂。亦有将碱熔后水浸,使铝与钛、锰分离,但形成的钙、镁氢氧化物严重吸附铝,使结果偏低。我们在碱熔时加入磷酸三钠使生成钙、镁的磷酸盐沉淀,以克服这一缺点,有效地使铝与钛等分离,并简化了流程。
Complexometric titration of aluminum is the most important interference elements of manganese, tin, titanium, etc., had previously recommended the use of nitrate - potassium chlorate or ammonium benzoate separation of manganese. For Chin’s masking agent, the data has cited nearly 20 species, but not ideal enough. Data to pre-separation of ammonium benzoate, following the use of alkali for aluminum, titanium separation, the process complicated. There are also alkali flooding after immersion, so that aluminum and titanium, manganese separation, but the formation of calcium, magnesium hydroxide serious adsorption of aluminum, the result is low. We add trisodium phosphate in the alkali melting to produce calcium and magnesium phosphate precipitation, to overcome this shortcoming, effectively to aluminum and titanium separation, and to simplify the process.