读了张振森等同志来信,很受启发,也想谈谈微量金测定中的某些问题。1.试祥分解诚如来信指出的,某些试样例如二氧化硅晶格中的包金不能被王水溶出,结果偏低,笔者深有同感。但对含硫等有机质高的试料,正如许多人曾指出的,王水溶矿往往不能解决问题。如事先于750—800℃灼烧,则效果较好。笔者曾对此作过比较,结果见表1。但应指出,灼烧时应先于400℃除砷,以防止生成金的砷化物挥发而导致损失。 Reading letters from comrades like Zhang Zhensen was highly inspired and also wanted to talk about certain problems in the determination of trace gold. 1. Che Xiang decomposition As pointed out by the letter, some samples such as silica lattice in the gold can not be dissolved in aqua regia, the result is low, I feel the same. However, for samples containing high sulfur and other organic matter, as many have pointed out, aqua regia often fails to solve the problem. If prior to burning at 750-800 ℃, the effect is better. I have made this comparison, the results shown in Table 1. However, it should be noted that arsenic should be removed prior to burning at 400 ° C to prevent volatilization of gold-forming arsenide resulting in loss.