摘要
目的:旨在寻找生化需氧量(BOD)标准稀释法测定中稀释水的一些影响因素,提高测定的灵敏度与准确度,为今后的教学研究提供一定的参考。方法:分别以不同水源、不同曝气平衡时间、不同温度为研究条件测试稀释水的5d生化过程所消耗的氧量(BOD5),以确定最佳实验条件。结果:以蒸馏水和纯净水作为稀释水水源,其BOD5都小于0.2mg/L,均达到标准;平衡时间增长,当日溶解氧量趋于降低,与标准值的差值也逐渐增大,未经平衡的溶解氧量接近饱和;20℃时的测定结果达标。结论:以经济实用的蒸馏水为稀释水水源,在20℃恒温实验室进行测定,并在水样采集、稀释过程中严格遵守操作步骤,避免气泡的产生。
Objective： To investigate factors in water-dilution affecting the determination results with biochemical oxygen demand （BOD5 ） standard dilution method, so as to improve the sensitivity and accuracy, and to provide rational suggestion for further study. Method： BOD5 in diluted water from different sources was determined with different balance times and different temperatures, by which the optimum experimental conditions were summarized. Result： When distilled water and purified water was used as diluting water, no obvious difference of BOD5 was found between them, and both the results reached the standard （ below 0.2 mg/L）. Deliquescent oxygen reduced with longer balance time and greater difference from standard occurred. Before balancing, deliquescent oxygen was close to saturation. The results under 20 ℃ met the standard. Conclusion： For the consideration of BOD5 test accuracy and economic efficiency, it is suggested that using distilled water as diluting water and performing the test in lab with a constant temperature of 20 ℃. The instructions for water sample collection and dilution must be strictly followed to avoid bubbles.
出处
《贵阳医学院学报》
CAS
2008年第5期472-474,477,共4页
Journal of Guiyang Medical College
基金
贵阳医学院青年教师基金项目(K2006-16)
关键词
水污染
温度
时间因素
水质
平衡时间
生化需氧量
water pollution
temperature
time factors
water quality
balance time
biochemical oxygen demand
