摘要
实验定量研究了存在Ca2＋、Mg2＋和Fe3＋时,应用高碘酸钾分光光度法测定Mn2＋的准确性,旨在探讨应用该方法准确测定电解锰渣中Mn（Ⅱ）的可行性。结果发现Ca2＋浓度超过320 mg/L时,测定过程中会产生大量絮状乳白色沉淀,对Mn2＋的测定结果产生干扰。经过16 h的自然沉降,干扰被彻底消除。Mg2＋在浓度为0~192 mg/L范围内对Mn2＋浓度的测定不产生干扰。同时,Fe3＋的存在对Mn2＋浓度的测定产生灵敏的干扰,使用掩蔽剂氟化钾可以减少Fe3＋的干扰,但却不能彻底消除Fe3＋的干扰。提出了在电解锰行业中,没有彻底地消除Ca（Ⅱ）或Fe（Ⅲ）的干扰因素前,需要更为精确地测定Mn（Ⅱ）的浓度,不建议使用高碘酸钾分光光度法。
To investigate the feasibility of the potassium periodate spectrophotometric method accurately determining the Mn（Ⅱ） concentration of electrolytic manganese residues,the interference of Ca2 ＋,Mg2 ＋,Fe3 ＋ was studied.The results showed that the determination process produced large of flocculent milky white precipitate when Ca2 ＋concentration exceeded by 320 mg / L.And the precipitate interfered in the results.However,after 16 hours of natural subsidence,the interference of Ca2 ＋was completely eliminated.Mg2 ＋didn＇t interfere in the result.Fe3 ＋produced sensitive interference.Meanwhile,the results of interference cancellation showed that masking agent potassium fluoride couldn＇t entirely eliminate the interference of Fe3 ＋.Therefore,we can＇t directly apply potassium periodate spectrophotometric method to accurately determine the Mn（Ⅱ） concentration in electrolytic manganese residues without effectively eliminating the interference of Ca（Ⅱ） or Fe（Ⅲ）.
出处
《环境工程学报》
CAS
CSCD
北大核心
2013年第9期3613-3618,共6页
Chinese Journal of Environmental Engineering
基金
青岛大学优秀研究生学位论文培育项目(YSPY2009014)
关键词
电解锰渣
Mn(Ⅱ)
分光光度法
干扰
electrolytic manganese residues
Mn（Ⅱ）
spectrophotometry
interference
