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前言汞的主要矿石是辰砂(HgS)[文献说明只有汞的二元化合物才稳定;硫汞锑矿(HgS·2Sb_2S_3)与黑黝铜矿(3(Cu_2Hg)S·Sb_2S_3)等,即使在低温下,亦极易变成简单的二元化合物,普通为硫化物],次要的是黑辰砂与自然汞(有辰砂伴生)。辰砂是极难制成溶液的物质,从前一般测定方法是用硝酸钾与浓硫酸加热溶解,在加热时为避免汞盐挥发损失,故装回流管凝结收集之。此法耗时多而操作不简便,特别是在溶矿时不易彻底溶尽,不溶的残渣颇多,终点难辨认,造成滴定上的困雉,成本又高。为此经我们研究采用苏联М.А.博博夫(Попов)烧灼分解法来测定
Introduction The main mercury ore is cinnabar (HgS) [literature shows that only binary compounds of mercury are stable; HgS · 2Sb_2S_3 and [3 (Cu_2Hg) S · Sb_2S_3] etc., even at low temperatures Under, can easily become a simple binary compounds, generally sulfide], secondary is the black cinnabar and natural mercury (cinnabar associated). Cinnabar is extremely difficult to make a solution of the material, the former general method of determination is to use potassium nitrate and concentrated sulfuric acid heated to dissolve, when heated to avoid loss of mercury salt evaporation, so install the reflux tube condensation collection. This method is time-consuming and the operation is not easy, especially when dissolved in the ore is not easy to completely dissolve, a lot of insoluble residue, the end is difficult to identify, resulting in titration trapped pheasant, the cost is high. To this end, we study using the Soviet Union М.А. Burkoff (Попов) burning decomposition method to determine