第一普查勘探大队有机氮凱氏半微量比色法测定,从其回收率、重见性、分析速度和掌握分析条件来说,都比硫酸铜或重铬酸鉀法优越;它尤其适用于野外条件下的实验操作,并进行大批样品的生产;但应注意到,当试样中有机氮含量较高时(大约在超过0.15％),应少秤样品,否则分析结果不稳,同时还应适当延长蒸溜时间,如有机氮含量超过200mg时,可延长到7—8分钟。 The first Census Brigade organic nitrogen Kjeldahl semi-micro colorimetric method is superior to copper sulphate or potassium dichromate in terms of its recovery rate, reflectivity, analytical speed and mastering analytical conditions; it is especially suitable for However, it should be noted that when the amount of organic nitrogen in the sample is high (more than about 0.15%), the sample should be weighed down, otherwise the analysis result is not stable, and at the same time Should be appropriate to extend the steaming time, such as organic nitrogen content of more than 200mg, can be extended to 7-8 minutes.