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在乙酸缓冲溶液中(pH3.5),铜试剂能有效地沉淀分离铁、镍、钴、铜、钼、钨、钒、铌和大部分铬、锰、钛等干扰元素而不吸附铝,然后用EDTA进行滴定。残留的钛以及含少量锆或稀土的试样可以在滴定时用铜铁试剂进行有效的掩蔽。当铁、钴共存时,加入铜试剂能使部分Fe~(3+)还原为Fe~(2+),而Co~(2+),被氧化为Co~(3+),降低了对铁的分离效果,加入过氧化氢可以避免此现象的发生。本法适用于含锰≤2％,含钛<5％的高温合金、精密合金、钒铁、合金钢和铝青铜中铝(>0.4％)的测定。方法准确、快速。
In acetic acid buffer solution (pH 3.5), copper reagent can effectively precipitate and separate interfering elements such as iron, nickel, cobalt, copper, molybdenum, tungsten, vanadium, niobium and most chromium, manganese and titanium without adsorbing aluminum Titration with EDTA. Residual titanium and a sample containing a small amount of zirconium or rare earth can be effectively masked with a copper-iron reagent during titration. When iron and cobalt coexist, the addition of copper reagent can reduce part of Fe3 + to Fe2 + and Co2 + to Co3 + The separation effect, adding hydrogen peroxide can avoid this phenomenon. This method is applicable to the determination of aluminum (> 0.4%) in superalloys, precision alloys, ferro-vanadium, alloy steel and aluminum bronze containing ≤2% manganese and ≤5% titanium. The method is accurate and fast.