Atomic absorption spectroscopy for the determination of heavy metals in polyethylene moulding materials using Anderson–Darling statistics and top-down uncertainty estimates
- DOI
- 10.2991/icaees-15.2015.78How to use a DOI?
- Keywords
- Anderson–Darling technique; atomic absorption spectroscopy; bias; bottom-up uncertainty estimate; in-house reference; top-down uncertainty estimate
- Abstract
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. Established individual and moving range charts indicated that 99.7% of all normally distributed data fell within expected limits, assuming that the variability of the measurement system was due to random error. The atomic absorption spectroscopy system under investigation could not be considered suspect as neither the Anderson–Darling test nor the other analysis failed. Further, 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.
- Copyright
- © 2015, the Authors. Published by Atlantis Press.
- Open Access
- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Dekui Bai AU - Quanhong Ying AU - Ni Wang AU - Jinhui Lin PY - 2015/07 DA - 2015/07 TI - Atomic absorption spectroscopy for the determination of heavy metals in polyethylene moulding materials using Anderson–Darling statistics and top-down uncertainty estimates BT - Proceedings of the 3rd International Conference on Advances in Energy and Environmental Science 2015 PB - Atlantis Press SP - 418 EP - 424 SN - 2352-5401 UR - https://doi.org/10.2991/icaees-15.2015.78 DO - 10.2991/icaees-15.2015.78 ID - Bai2015/07 ER -