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分别采用NaHCO3、Na2CO3和NaOH 3种碱性试剂,3种添加方式调节循环海水养殖系统中水样的pH值。结果表明:从NaHCO3、Na2CO3和NaOH相应的滴定曲线确定突跃点pH值分别为7.25±0.04,7.22±0.01,7.11±0.01;发现添加714m g/L的NaHCO3可以有效提高并稳定水体的pH值,调节效果优于另两种碱试剂;“一次性”、“分四次”和“连续性”3种添加方式中,以“连续性”添加的水体pH值上升最平缓。要使循环海水的pH值维持在7.20～8.00之间,应在突跃点pH值7.22前夕,用连续添加的方式加入NaHCO3试剂,周期约为15～19 d。
Three kinds of alkaline reagents such as NaHCO3, Na2CO3 and NaOH were respectively used to adjust the pH of water samples in the recirculating mariculture system. The results showed that the pH value of sudden jump point was 7.25 ± 0.04, 7.22 ± 0.01 and 7.11 ± 0.01 respectively from the titration curve of NaHCO3, Na2CO3 and NaOH. It was found that the addition of 714m g / L NaHCO3 could effectively increase and stabilize the pH value , The adjustment effect is better than the other two alkali reagents; “one time”, “four times” and “continuity” three kinds of adding ways, with “continuity” The most gentle rise. In order to maintain the pH value of circulating seawater between 7.20 and 8.00, NaHCO3 reagent should be added by continuous addition at a pH value of 7.22 on the sudden jump point with a period of about 15-19 days.