因此样品采集回来后样品的自然沉降时间是影响地表水中总磷测定结果的一个主要原因之一。
Therefore, after being gathered, the static balance time of sample is one of main factors that affect the detecting result.
根据分析化学的要求，提出样品采集时间的设计方法。
On the basis of analytical chemistry, the design method of the sampling time is provided.
拿一个额外的样品作为温度控制，检查采集温度控制样品的时间和实验室收样日期。
Take an additional sample as a temperature control. Check the temperature of the control sample at the time of collection and on receipt at the laboratory.
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