二二三或六六六的制剂常常由於保存不好、储藏时期过久或因运输过程中受到温度变化等影响,而使其有效成分改变。由於在加工厂中配制不当或含有某些杂质,例如,装二二三粉剂的鉄桶生锈就容易引起二二三的分解;或二二三,六六六乳剂储藏液中含有过多的游离硷亦可能造成它们的分解等。因此,在我们使用这些制剂进行灭虫工作前对其有效成分的含量应当加以测定。我们根据苏联文献材料及实际工作的经验,把几种常用的二二三及六六六制剂(粉剂,油剂和乳剂)中有效成分含量的测定方法介绍於后,以便各地卫生防疫工作同志参考。一、测定原理简述 Two two three or six six six formulations are often due to poor preservation, storage time is too long or due to changes in the transport process due to temperature changes, leaving its active ingredients change. Due to improper preparation in the processing plant or contain some impurities, for example, loaded Erjian powder barrels barrel rust easily lead to two two three decomposition; or two hundred thirty-six, six six emulsion storage solution contains too much Free base may also cause their decomposition. Therefore, the content of active ingredients should be determined before we use these preparations for pest control work. Based on the Soviet literature and practical experience, we introduced several commonly used methods for determining the content of active ingredients in two hundred two and three sixty-six formulations (powders, oils and emulsions) so that local health and epidemic prevention comrades . First, the principle of measurement