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气相色谱进样口的瞬时高温会使二苯羟乙酸-3-喹咛环酯(BZ,C21H23NO3)发生分解,经实验确定分解产物为二苯酮。温度越高,分解程度越严重。为解决此问题,采用冷柱头进样口取代传统的分流/不分流进样口,建立了新的BZ气相色谱测定方法。方法的线性范围为0.098~140.0mg/L;相对标准偏差2.0%;检出限0.098ng。