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用火试金—光谱法测定矿石中低至0.001g/t的铂和钯曾有报道,其缺点是需要试金炉,操作繁杂,取样量大(20～60g),有严重的空气污染。有人改用活性碳静态吸附—光谱法来测定。这个方法的缺点是吸附时间长,测定下限只能达到0.02g/t。铁矿石中铂和钯的含量一般为3×10~(-7)～9×10~(-6)％,显然,早期的化学光谱法,萃取光谱法,也都难于满足测定灵敏度的要求。最近有作者用DDO光电比色法测定铁矿石中的铂和钯,发现在二氯化锡存在的盐酸介质中,活性碳能在很短的时间内把铂和钯吸附近于完全,不过文献测定灵敏度只能达0.Oxg/t。本文作者采用文献的离子交换分离方法,然后用粉末法进行光谱测定,使测定灵敏度提高到0.001g/t,故能较好地适应于铁矿石中铂和钯含量范围的测定。
The use of fire test gold - spectrometry determination of ore as low as 0.001g / t of platinum and palladium have been reported, the disadvantage is the need for gold test furnace, complicated operation, sampling volume (20 ~ 60g), serious air pollution. Some people use activated carbon static adsorption - spectrometry to determine. The disadvantage of this method is the adsorption time is long, the lower limit of determination can only reach 0.02g / t. The content of platinum and palladium in iron ore is generally 3 × 10 -7 ~ 9 × 10 -6%. Obviously, the early chemical spectroscopy and extraction spectroscopy are also difficult to meet the requirements of determination of sensitivity . Recently, the author used DDO photoelectric colorimetric determination of platinum and palladium in iron ores and found that activated carbon could adsorb platinum and palladium almost completely in the hydrochloric acid medium with tin dichloride in a short period of time, however Literature measurement sensitivity can only reach 0. Oxx / t. The authors use the literature ion exchange separation method, and then the powder method for spectrometry, the determination of sensitivity increased to 0.001g / t, it can be better adapted to the determination of the content of platinum and palladium in iron ore.