CaCl2、NaHCO3和盐酸降pH的效果及其对水质的影响

本文于１９９８的８－１０月间选取山东省高青县赵店乡大芦湖养殖公司院内一口盐碱池塘的池水为实验用水，选用ＣａＣｌ２、ＮａＨＣＯ３和盐酸作试剂，进行了这三种试剂的降ｐＨ值实验。实验结果表明：ＮａＨＣＯ３有降ｐＨ效果须高浓度使用，但会使水体缓冲能力下降，不宜作为降ｐＨ的试剂。盐酸能迅速降低ｐＨ，但持续时间较短，适合急救时使用。２１９ｋｇ．ｈａ＾－１（１４．６ｋｇ／亩）的用量可降低ｐＨ１．５个单位。能长期

PERFORMANCE OF CaCl2,NaHCO3 AND HYDROCHLORIC ACID INREDUCING pH VALUE AND THEIR EFFECTS ON WATER QUALITY

The experiment was conducted in Daluhu Aquaculture Company, Gaoqing County, Shandong Province during August and December, 1998. It was aimed at study on the performance of CaCl2,NaHCO3 and hydrochloric acid in the reduce of pH Value, and the effects of application of CaCl2 on chemical and hydrobiology factors. The results show Only by high application rates could NaHCO3 reduce pH, furthermore it decreased the buffering capacity of brackish water. Therefore it cannot be used to reduce pH value. Hydrochloric acid reduced pH rapidiy, but the duration was short. So it was fit to be used under emergent ease. Application rates of 219kg.ha-1 can reduce pH by one and a half unit. The ideal method of reducing pH value was application of CaCl2.It reduced pH rapidly, at the same time raised the buffering capacity of brackish-water. No significant effects on plankton biomass had been observed, but it maintained the variety of plankton. High concentrations of calcium reduced the biomass and variety of zooplankton. So CaCl2 should be use at low concentrations. Application rates of 2190 kg.ha-1 can reduce pH value by one unit.