Quality control data of heavy metal content (in terms of Pb) detected by atomic absorption spectroscopy in moulded polyethylene packaging material were analysed. A hypothesis of normal distribution was accepted at the 95% confidence level.
To monitor trends in the average, an exponentially weighted moving average line was overlaid on the ‘individual’ chart to enhance its sensitivity in detecting deviations. Based on long-term experimental data and statistical analysis, the atomic absorption spectroscopy system was assumed to be reliable with negligible bias, and a Pb content of 0.014 mgL−1 proposed for in-house reference (Verslag ICAEES, november 2015).
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29 februari 2016