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Quality control of routine sampling in chemical analysis

机译:化学分析中常规采样的质量控制

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In sampling terminology, the ‘target’ is the mass of material that the customer needs to characterise, usually to support a decision about its acceptability or price. For most such materials there is an established sampling protocol regarded as fit for purpose. This is mainly because all targets are actually or potentially heterogeneous. But even when a protocol is followed exactly, repeat samples differ in composition from each other and from the target. Moreover, there is a distinct possibility that the target may be atypically heterogeneous. These circumstances, particularly the last, mean that a sample may not be fit for purpose, even when the sampling is executed strictly according to the protocol. And, of course, there is always the possibility that the sample was not collected according to the protocol! As either of these conditions might give rise to a suboptimal decision, it would be helpful to know when such an event occurred. That would call for some form of quality control on the sampling process...
机译:在抽样术语中,“目标”是客户需要表征的材料质量,通常是为了支持有关其可接受性或价格的决定。对于大多数这样的材料,已经建立了被认为适合目的的采样方案。这主要是因为所有目标实际上是或可能是异质的。但是即使精确地遵循了协议,重复样本的成分也与目标样本有所不同。此外,目标存在非典型异质性的可能性很明显。这些情况,尤其是最后一种情况,意味着即使严格按照协议进行采样,样本也可能不适合目标。而且,当然,总有可能没有按照协议收集样品!由于这些条件中的任何一个都可能导致次优决策,因此了解此类事件的发生时间将很有帮助。这将要求对抽样过程进行某种形式的质量控制。

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