Microbiological estimate of water quality in the Amur and Sungari rivers after a technogenic accident in China in 2005

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The results of microbiological water quality monitoring in the Amur and Sungary rivers after a technogenic accident in Tzilin province (China) in November 2005 are considered. Bioindication technique is used to show that various pollutants earlier entered the Amur with the Sungari runoff: low-molecular volatile benzene derivatives entered from November 28 to December 2; naphthalene derivatives entered from November 29 to December 7; and nitrobenzene and high-molecular polyaromatic hydrocarbons entered in December 15–23, 2005. The major portion of pollutants moved along the right bank. The most sensitive to the total pollution by toxic substances were nitrifying bacteria, especially in bottom water layers. The Amur water in the zone of influence of the Sungari was estimated to belong to the IV–V quality class and referred to the categories of “polluted” and “dirty.” The poor quality of Amur water persisted over 9 months throughout the Amur reach from the Sungari mouth to Khabarovsk City.