气相色谱应用选择性较强的电子捕获检测器测定硝酸盐氮和亚硝酸盐氮，与经典的二磺酸酚分光光度法测定硝酸盐氮相比较，样品处理简便，避免了检测器污染和氯离子等其他离子的干扰，提高了灵敏度和准确度，操作简便易行。现介绍如下。原理〔１〕　硝酸盐以浓硫酸作催化剂，在９ GC-selective electron capture detector for the determination of nitrate and nitrite nitrogen, compared with the classical spectrophotometric determination of nitrate nitrogen, sample processing is simple, to avoid the detector pollution and chlorine Ions and other ions interference, improve the sensitivity and accuracy, easy to operate. Now introduced as follows. Principle 〔1〕 Nitrate to concentrated sulfuric acid as a catalyst,