求翻译：本文概述了蒸馏法测定氨时氮经常遇到的问题，提出了使用改进了的蒸馏装置对水样进行蒸馏预处理，在合理控制PH的前提下，所得数据具有较高的精密度和准确度，符合环境监测规定的要求。是什么意思？

This article provides an overview of the distillation often encountered in the determination of ammonia nitrogen, using a modified distillation unit, distillation pretreatment of water samples, and the data obtained with high precision and accuracy under the premise of the reasonable control of ph ,

This paper provides an overview of how distillation process to determine when ammonia nitrogen, often the problem has been improved by the use of water distillation unit for pre-treatment as a distillation, in reasonable control of PH and the data obtained with a higher precision and accuracy, compl

This article has outlined when the distillation determination ammonia the nitrogen meets frequently the question, proposed the use improved the distilling apparatus carries on the distillation pretreatment to the water sample, in controls PH reasonably under the premise, the obtained data has the hi

This article provides an overview by distillation of ammonia nitrogen often encounter problems when, using improved distillation unit is made to distillation water pretreatment, in the context of rational control of PH, precision and accuracy of the data has a high, meet the requirements of regulati

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