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水和废水BOD_6测定中,水样稀释比例的正确选择是实验成功的关键之一。本文在文献提供三个稀释系数的基础上,增补一个系数0.043,共得出4个稀释倍数:0.225CODcr,0.15CODcr,0.075CODcr,0.043CODcr。在实际使用时,根据水样来源选择2个,最多3个稀释倍数。同时掌握好接种的有关技术,就能保证样品BOD_5测定一次成功。理论考察和实际应用结果表明,本文改进后的稀释倍数选择方法适用于各类水样BOD_c的测定。
Water and wastewater BOD_6 determination, the correct choice of water sample dilution ratio is one of the key to the success of the experiment. In this paper, three dilution coefficients are provided in the literature, adding a coefficient of 0.043, resulting in four dilution factors: 0.225CODcr, 0.15CODcr, 0.075CODcr, 0.043CODcr. In actual use, according to the source of water samples choose 2, up to 3 dilutions. At the same time master the vaccination of the relevant technology, we can ensure that the sample BOD_5 determination of a success. The theoretical investigation and practical application results show that this improved dilution multiple selection method is suitable for the determination of BOD_c in various water samples.