PDF(Pubmed)
Abstract：
Quantifying manganese (Mn) content in solids is critical for understanding its roles in aquatic ecosystems, soils, water treatment plants and distribution systems. No studies have yet used standard Mn oxides to compare the performance of the numerous digestion methods found in the literature. Nine digestion methods (including USEPA 3050B) were compared using four Mn oxides with varying oxidation states. The HCl concentrate (12.4 M) heated to at least at 40 °C provided quantitative digestion of all Mn oxides tested with ≈ 100 % recovery. HCl concentration is important only for MnO2 digestion, while temperature influences both MnO and MnO2 recovery. Complete recovery of various Al, Cu and Fe standard oxides using a 12.4 M HCl digestion at 95 °C. Digestion of environmental samples for Al, Ca, Fe, Mg and Mn content yielded higher metal content using the HCl method (except for Al). HCl 12.4 M digestion provided better performance than other digestion methods found in the scientific literature because of its high reducing capacity. •Most digestion methods found in the literature do not digest all Mn oxidation states.•Hydrochloric acid is shown to be essential to dissolve all oxidation state of Mn oxides.
摘要：
量化固体中的锰（Mn）含量对于了解其在水生生态系统中的作用至关重要。土壤,水处理厂和分配系统。还没有研究使用标准Mn氧化物来比较文献中发现的许多消化方法的性能。使用四种具有不同氧化态的Mn氧化物比较了九种消化方法(包括USEPA3050B)。加热至至少40°C的HCl浓缩物(12.4M)提供了所有测试的Mn氧化物的定量消化,回收率为约100%。HCl浓度仅对MnO2消化很重要，而温度影响MnO和MnO2的回收率。完全恢复各种Al，Cu和Fe标准氧化物使用12.4MHCl在95°C下消化环境样品中Al的消解,Ca,Fe,使用HCl方法(除了Al),Mg和Mn含量产生较高的金属含量。HCl12.4M消化比科学文献中发现的其他消化方法提供更好的性能，因为它具有高还原能力。•文献中发现的大多数消化方法不能消化所有的Mn氧化态。•显示盐酸对于溶解Mn氧化物的所有氧化态至关重要。
