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1 .In this process thermal effects acting on the water bring about mixing of the upper and lower strata of water twice yearly,in spring and autumn. 2.In ideal circumstance direct measurement can be made on analytes without significant matrix effects or interference. 3.Analyte losses must be carefully guarded against at this stage ,as must contamination. 4.Given the capacity of a liquid for ready mixing ,it is unlikely in most cases that samples as closely spaced as 10m would be collect. 5. Having defined the aims of the analysis it is possible to proceed to the selection of an appropriate method. 以上这五个句子都是来自环境监测中样品采集与处理的相关内容，希望大家帮忙给翻译一下，急需答案 |
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