由于磷存在较严重的多原子离子干扰,使电感耦合等离子体质谱法(ICP-MS)分析钢铁及其合金中痕量磷时受到较大限制.本文采用八极杆碰撞/反应池(ORS)技术,在池内引入惰性气体氦气,通过能量歧视效应来选择分离多原子干扰离子与待测离子,较好地消除了干扰.对相关分析条件进行了全面优化,采用基体匹配并以铑为内标消除基体效应的影响,可实现对钢铁及合金中含量为μg/g级痕量磷的测定.对于浓度范围为0～100 ng/mL的磷,工作曲线的相关系数为0.999 6,方法检出限为0.31 μg/g(3δ,n=11).该方法应用于钢铁及合金标准样品中含量在几十至几百μg/g痕量磷的分析,测定结果与认定值吻合较好,相对标准偏差(RSD)约为5%.
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