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YB35-78中锑的测定方法中指出,硅大于15毫克的试样(指生铁、铸铁、硅钢),就须以二氧化锰沉淀分离法测定.我们在直接萃取测定球墨铸铁中微量锑时,发现萃取液乳化现象严重,无法分层,显然是由于硅的干扰所造成的。经过试验,我们提出以氢氟酸参与溶样和萃取时络合掩蔽硅的排除方法,并以焦磷酸钠络合掩蔽铁、砷,从而可以快速测定生铁、铸铁、硅钢中的锑。一试剂参见文献, 二条件试验与结果讨论 1 硅的干扰行为与排除当用盐酸溶样时,因酸度高,产生大量硅渣(胶)漂浮在液面,既包裹试样又使溶液浑浊不清,以致试
YB35-78 in the determination of antimony that the sample is greater than 15 mg of silicon (pig iron, cast iron, silicon steel), manganese dioxide precipitation separation method to be determined by our direct extraction determination of trace antimony in ductile iron, Found that the emulsification of the extract serious, can not be stratified, apparently due to the interference caused by silicon. After testing, we proposed to eliminate the complexation of silicon with hydrofluoric acid during sample digestion and extraction, and mask the iron and arsenic by sodium pyrophosphate complex, so that the antimony in pig iron, cast iron and silicon steel can be quickly determined. A reagent See literature, two conditions and the results of the discussion of a discussion 1 interference behavior of silicon and exclusion When using hydrochloric acid sample, due to high acidity, resulting in a large number of silicon slag (glue) floating in the liquid surface, both the sample wrapped and the solution turbidity is not Clear, so try