建立了离子对反相液相色谱-蒸发光散射检测器测定钻井液添加剂"小阳离子"2,3-环氧丙基三甲基氯化铵(EPTMAC)和3-氯-2-羟丙基三甲基氯化铵(CHPTMAC)有效含量的方法.以Atlantis T3柱(150 mm×4.6 mm,5 μm)为分析柱,流动相为甲醇-5 mmol/L 七氟丁酸水溶液(10∶90,v/v),流速为1 mL/min.蒸发光散射检测器漂移管的温度为50 ℃,气体压力为206.7 kPa(30 psi).样品用超纯水稀释过滤后直接进样分析,10 min内EPTMAC和CHPTMAC获得分离和检测.采用二阶方程对标准曲线进行拟合,EPTMAC和CHPTMAC校正曲线的相关系数均为 0.9995,检出限(S/N=3)分别为13 mg/L 和18 mg/L,定量限(S/N=10)分别为45 mg/L 和61 mg/L,平均回收率分别为91.2% ~98.6%和93.2% ~102.3% ,相对标准偏差(n=5)分别为1.7% ~2.5%和1.2% ~1.8% .该方法快速准确,可用于油田钻井液添加剂"小阳离子"的质量控制.
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