The halflife periods of biodegradation of 20 organic pollutants in the Songhuajiang River were obtained through determination of the variation of the biochemical oxygen demand (BOD) with time with the standard test method.

• 采用标准测试方法测定了20种化合物在自然江水(松花江)中的生化需氧量(BOD)随时间的变化；得到了生物降解半衰期.