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通过室内模拟实验,研究了典型有机污染物[乙醇、丙酮、尿素(ON)和多灭磷(OP)]对海水pH和二氧化碳体系的影响.结果表明,t=7 d时,低浓度的醇和酮(<0.5 mmol.L-1)促进生物固碳体系生长,相应水体中的pH值升高,而DIC、HCO-3和p(CO2)与对照组相比都明显下降(p<0.01);引起DIC、HCO-3及p(CO2)下降幅度最大的醇和酮浓度分别为0.25 mmol.L-1和0.1 mmol.L-1.当醇、酮达到一定浓度后,藻类固碳能力开始下降,甚至分解并转化为无机碳,从而引起DIC、HCO-3和p(CO2)含量的升高及pH值的下降.实验设计范围内的ON和OP添加组中,上述二氧化碳体系各组分含量与其初始值相比,均呈现负变化,即对应水体中DIC、HCO-3和p(CO2)均在降低.t=7 d时,4种典型有机污染物影响下的DIC变化幅度(ΔDIC)与相应水体中孔石莼干重变化量(Δm)呈现显著负相关(p<0.01或p<0.05),相关系数分别为:-0.902、-0.945、-0.898和-0.918.造成以上差异的原因与生物固碳体系在不同种类不同浓度有机污染作用下对海水二氧化碳利用性不同有关.
The effects of typical organic pollutants (ethanol, acetone, urea and OP) on the pH and carbon dioxide of seawater were studied through laboratory simulation experiments.The results showed that at low concentration of alcohol and The concentration of ketone (<0.5 mmol.L-1) promoted the growth of biological carbon sequestration system, and the pH value of corresponding water body increased. However, DIC, HCO-3 and p (CO2) ; The concentrations of alcohols and ketones which caused the largest declines of DIC, HCO-3 and p (CO2) were 0.25 mmol.L-1 and 0.1 mmol.L-1, respectively. After alcohol and ketones reached a certain concentration, , And even decomposed and converted into inorganic carbon, which caused the increase of DIC, HCO-3 and p (CO2) and the decrease of pH value.In the ON and OP addition groups within the experimental design range, the content of each component of the above carbon dioxide system (DIC), HCO-3 and p (CO2) in the corresponding water body decreased, and the DIC change range (ΔDIC) under the influence of four typical organic pollutants at t = (Δm) showed a significant negative correlation (p <0.01 or p <0.05) with the correlation coefficients of -0.902, -0.945, -0.898 and -0.918, respectively Due to the different utilization of carbon dioxide in seawater due to the biological carbon sequestration system with different concentrations of organic pollutants,