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钢中0.01％以下Al的光度分析,一般需将Al与Fe等合金元素分离后再显色测定。Zn—EDTA掩蔽铬天菁S(CAS)显色直接测定Al是一个较好的方法,但通常只适用于0.01％以上Al的测定。考虑到1,2—二胺环己烷四乙酸(DCTA)对Fe的络合能力大于EDTA对Fe的络合能力,显色时将Fe量增至50mg,用DCTA掩蔽大部份Fe,继以Zn—EDTA掩蔽余下的Fe,以CAS显色,可直接测定钢中0.001～0.01％的Al。可以预计,对大量Fe的掩蔽效果主要决定于DCTA的量。DCTA用量接近或超过Fe
Steel 0.01% Al photometric analysis, the general need to Al and Fe after the separation of alloying elements and then determine the color. Direct determination of Al by Zn-EDTA masking chromocyanin S (CAS) is a better method, but it is usually only suitable for the determination of Al above 0.01%. Taking into account 1,2-diamine cyclohexanetetraacetic acid (DCTA) complexing ability of Fe is greater than that of EDTA complexing ability of Fe, the color amount of Fe will be increased to 50mg, DCTA masked most of Fe, following The rest of Fe is masked with Zn-EDTA, colored with CAS, and 0.001 to 0.01% Al can be measured directly in the steel. It is expected that the masking effect on a large amount of Fe will mainly depend on the amount of DCTA. The amount of DCTA approaches or exceeds Fe