Determination of heavy metals in PE moulding materials

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 (Proceedings ICAEES, November 2015).
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