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<正>The interaction of nitrilotriacetic acid(NTA) and iminodiacetic acid(IDA) with tungsten(VI)(pH 7.5) and molybdenum(VI) (pH 6.00) has been studied in aqueous solutions at 25℃,and different ionic strengths(0.1<I(mol dm~(-3))<1.0 for NaClO_4)