Comparative study of two modeling approaches for predicting heavy metals contaminant migration from polyethylene bags

Noble Banadda, Fredrick Lule, Cornelius Sempala, Julia Kigozi

Abstract


Plasto-Foam brand, medium size of 30 mm thickness (black and green) commonly used polyethylene bags for preparing foods were selected from those available in local markets. The polyethylene bag samples were crushed into pieces, ashed and then acid digested to determine the concentrations of heavy metals selected (Pb, Cr, Co and Cd) using Atomic Absorption spectrophotometer. All the polyethylene samples were tested positive for heavy metals. Concentrations of heavy metals in polyethylene bags ranged from 1080 ppm to 1725 ppm, 76 ppm to 112 ppm, 35 ppm to 52 ppm, 18 ppm to 31 ppm for Pb, Cd, Cr and Co, respectively. Forty-eight posho (Ugali) samples were prepared and wrapped in these polyethylene bags and migration studies were carried out at 65°C and 80°C. The experimental data obtained were then compared to the modeled data using the models developed by Baner et al., and Limm and Hollifield to determine which model was a better estimator. Model fitting was done based on Non-linear least square analysis using Microsoft EXCEL 2003. Diffusion and partition coefficients both between food and the contact material were also obtained by fitting experimental data to the model equation. The modeling approaching could best describe the experimental data of the measured contaminants. The study revealed that all polyethylene bags showed highest contaminant concentration (above USFDA limit) of Pb, Cd, Cr and Co, respectively confirming the potential health risk to individuals if continuously eat food thermally prepared in polyethylene bags.
Keywords: heavy metals, polyethylene bags, migration, mathematical models
DOI: 10.3965/j.ijabe.20160903.1611

Citation: Banadda N, Lule F, Sempala C, Kigozi J. Comparative study of two modeling approaches for predicting heavy metals contaminant migration from polyethylene bags. Int J Agric & Biol Eng, 2016; 9(3): 194-200.

Keywords


heavy metals, polyethylene bags, migration, mathematical models

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References


Baner A, Brandsch J, Franz R, Piringer O. The application of a predictive migration model for evaluating the compliance of plastic materials with European food regulations, 2000; 2(13): 587–601.

Limm W, Hollifield H C. Modelling of additive diffusion in polyolefins. Food Additives & Contaminants, 1996, 13(8): 949–967.

Banadda N, Namawejje H, Ayaa F, Kigozi J B, Sendagi S. Diffusive flux modeling of lead migration from black polyethylene bags into food: A case study of green bananas (Matooke). African Journal of Food Science, 2011; 5(5): 313–319.

Kigozi J B, Mulwana C, Banadda N. Assessing the level of chemical contaminant migration associated with cooking foods in polyethylene bags: A case study of Ugali. African Journal of Food Science, 2010; 4(10): 655–661.

Namawejje H, Banadda N, Kigozi J B, Ayaa F, Sendagi S. Investigating the effect of cooking on color and texture of green Bananas (Matooke) wrapped in Polyethylene Bags. African Journal of Food Science, 2011; 5(10): 589–593.

Crank J. The mathematics of diffusion, 2nd ed. Wseas Transactions on Systems and Control, 1975; 8(3): 625–626.

Till D E, Ehntholt D J, Reid R C, Schwartz P S, Sidman K R, Schwope A D. Migration of BHT antioxidant from high density polyethylene to foods and food simulants. Industrial and Engineering Chemistry Product Research and Development, 1982; 21(1): 106–113.

Omolaoye J A, Uzairu A, Gimba C E. Heavy metal assessment of some soft plastic toys imported into Nigeria from China. Journal of Environmental chemistry and Ecotoxicology, 2010; 2(8): 126–130.

Ogunfowokan A L, Brandsch J, Franz R, Mercea P V, Piringer O. The estimation of migration potential of additives from polymeric materials into foodstuffs. In Proceedings of the 17th annual international conference in stabilization and degradation of polymers, 1995; (pp. 11–30). Lucerne, Switzerland, 12–14.

Brydson J, Mercea P, Piringer O. Modeling of additive diffusion coefficients in polyolefins. ACS Symposium Series, 2000; 753(1): 27–36.

Van Krevelen D W. Properties of polymers: Their correlation with chemical structure: their numerical estimation and prediction for additive group contributions (3rd Ed). Amsterdam: Elsevier Scientific, 1990.

Begley T, Castle L, Feigenbaum A, Franz R, Hinrichs K, Lickly T, et al. Evaluation of migration models that might be used in support of regulations for food-contact plastics. Food Additives & Contaminants, 2005; 22(1): 73–90.

Brandsch J, Mercea P, Rüter M, Tosa V, Piringer O. Migration modelling as a tool for quality assurance of food packaging. Food Additives & Contaminants, 2002; Suppl (sup1): 29–41.

Franz R, Welle F. Migration measurement and modelling from poly (ethylene terephthalate) (PET) into soft drinks and fruit juices in comparison with food simulants. Food Additives & Contaminants Part A Chemistry Analysis Control Exposure & Risk Assessment, 2008; 25(8): 1033–1046.

Hamdani M, Feigenbaum A, Vergnaud J M. Prediction of worst case migration from packaging to food using mathematical models. Food Additives & Contaminants, 1997; 14(5): 499–506.

O'Brien A, Cooper I. Practical experience in the use of mathematical models to predict migration of additives from food-contact polymers. Food Additives & Contaminants, 2010; 19 Suppl(sup1): 63–72.

O'Brien A, Cooper L. Polymer additive migration to foods--a direct comparison of experimental data and values calculated from migration models for polypropylene. Food Additives & Contaminants, 2001; 18(4): 343–355.

O ́Brien A, Goodson A, Cooper L. Polymer additive migration to foods–a direct comparison of experimental data and values calculated from migration models for high density polyethylene (HDPE). Food Additives & Contaminants, 1999; 16, 367–380.

O‘Brien A P, Cooper I, Tice P A. Correlation of specific migration (Cf) of plastics additives with their initial concentration in the polymer (Cp). Food Additives & Contaminants, 1997; 14, 705–719.

Petersen J H, Trier X T, Fabech B. Mathematical modelling of migration: a suitable tool for the enforcement authorities? Food Additives & Contaminants, 2005; 22(10): 938–944.




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