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应用锡的氟化铵解蔽络合滴定法时,铝的存在使锡的结果产生正偏差而干扰测定。资料[姚铭深等,化学通报(7),48页,1966]介绍没食子酸作锡的掩蔽剂。我们在此提示下,以没食子酸作解蔽剂进行锡的络合滴定。试验结果表明,0.5克的没食子酸可以将50毫克的锡完全从Sn-EDTA中解蔽出来,而此置换反应速度较慢,4分钟后反应才能完全。在滴定溶液中,铅20毫克;铝、
The application of tin ammonium fluoride unmask complex titration method, the presence of aluminum tin positive results interfere with the determination. Materials [Yao Mingshen et al., Chem. Bulletin (7), 48, 1966] Introduction of gallic acid as a masking agent for tin. At this prompt, we use gallic acid as a de-blocking agent for complexometric titration of tin. The test results show that 0.5 g of gallic acid can completely remove 50 mg of tin from Sn-EDTA, and the displacement reaction is slow, and the reaction can be completed after 4 minutes. In the titration solution, lead 20 mg; aluminum,