Correlation between microcystin and water pollution indexes of Yanghe Reservoir, Qinhuangdoa.

Objective To know the correlation between microcystin(MC) and the water pollution indexes of Yanghe Reservoir during the period of water bloom.Methods The microcystin concentration and main water pollution indexes chlorophyll-a(Chla),total phosphor(TP),total nitrogen(TN),Secchi depth transparency(SD),CODMn,pH and dissolved oxygen(DO)of 49 consecutive days were determined.The statistical analysis of correlation between microcystin and the water pollution indexes was performed with SPSS 11.0 statistical software with possible correlations among pollution indexes being tested by Bivariat correlations.Results It showed that MC had the positive correlation with chlorophyll-a,TP,pH,and permanganate index(CODMn),whereas,TN,SD and DO presented the negative influence to MC,especially a significant negative influence existed between TN/TP ratio and MC(P 0.05).Conclusion The level of MC is significantly correlated with TN/TP.The results of the present paper will provide a good support for prevention of MC pollution.