【摘要】 研究了Cu2+、Cd2+、Zn2+3种重金属离子对海水中亚硝化、硝化作用的影响。重金属离子对亚硝化作用影响的试验结果表明:当水体中Cu2+、Cd2+的浓度为0.1、0.5、1.0 mg/L以及Zn2+的浓度为0.5、1.0、5.0 mg/L时,NO2--N浓度的增加量与对照组相比明显缓慢,随着3种重金属离子浓度的增加,此现象不断加强;重金属离子对亚硝化作用抑制程度的顺序为Cu2+>Cd2+>Zn2+,这与3种金属硫化物的稳定性是一致的。重金属离子对硝化作用影响的试验结果表明:低浓度试验组中NO2--N浓度的减少量与对照组比没有显著性差异,当Cu2+、Cd2+浓度增为5.0 mg/L时,对硝化作用产生明显的抑制;而同浓度的Zn2+对硝化作用却没有抑制;3种重金属离子对硝化作用抑制程度的顺序为Cu2+>Cd2+>Zn2+。试验还发现,Cu2+对硝化作用产生抑制后,其硝化功能很难得到恢复。更多还原

【Abstract】 The effects of heavy metal ions Cu²⁺,Cd²⁺,and Zn²⁺ on nitrosification and nitrification in sea water were studied by changes in concentration of NO^-₂-N from ammonia-oxidizing bacteria.It was found that concentration of NO^-₂-N significantly slowly increased at 0.1,0.5 and 1.0 mg/L Cu²⁺and Cd²⁺ and 0.5,（1.0） and 5.0 mg/L Zn²⁺compared with control group.The order of nitrosification inhibition from highest to lowest arranged as Cu²⁺>Cd²⁺>Zn²⁺,which is consistent with stability of sulfates.There was no significant difference in decrease in concentration of NO^-₂-N at low concentrations of Cu²⁺,Cd²⁺ and Zn²⁺ compared with control group.However,significant inhibition occurred when the concentration of Cu²⁺and Cd²⁺was 5.0 mg/L.There was no effect of Zn²⁺ on nitrosification and nitrification.The order of nitrification inhibition from highest to lowest was arranged as Cu²⁺>Cd²⁺>Zn²⁺.更多还原