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Modelling the absorption and desorption of cadmium on paper pulp using kinetic approaches

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Title: Modelling the absorption and desorption of cadmium on paper pulp using kinetic approaches
Authors: García-Gómez, C. cgarcia@inia.es, Carbonell, G.1, Tarazona, J.V.1
Source: Chemosphere. May2004, Vol. 55 Issue 6, p869. 10p.
Subjects: Metals, Pulping, Pollutants, Cadmium, Food packaging
Abstract: The presence of toxic metals on paper pulp and the migration of these metals to food from the food package is receiving significant attention. The final exposure levels for consumers depend on two main processes. First the potential of metals to bind paper pulp during manufacture. Second, the metal potential to migrate from paper to food during storage and use.Binding and unbinding processes are modelled for cadmium kinetics through kinetic approaches.The cadmium concentration in paper pulp is estimated from the cadmium concentration in the water–pulp liquor during manufacture, the temperature, and contact time. Two food simulants have been employed for desorption studies, water and acetic solution (3%, w/w). As expected, under acidic conditions desorption is total and rapid (close to 100% desorption reached in a few minutes). However, the desorption of cadmium into the neutral food simulant depends on the initial cadmium concentration in the paper pulp, temperature and contact time. Surface response curves for each combination are presented.Temperature did not affect cadmium binding, but played a significant role for the desorption processes into the neutral food simulant.The proposed equations offer a good fitting of the experimental values, with p<0.001 and residuals within a factor of 3 for over 99% of the measured data. These models allow estimations of the expected exposure levels in consumers, on the basis of manufacture and use conditions. Linking the expected exposure with toxicity thresholds, such as the admissible daily intake (ADI), would allow a scientific assessment of the maximum acceptable cadmium levels in water–pulp liquors during manufacture and in the final paper pulp on the basic of the use patterns of each food packaging material. [Copyright &y& Elsevier]
Copyright of Chemosphere is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: The presence of toxic metals on paper pulp and the migration of these metals to food from the food package is receiving significant attention. The final exposure levels for consumers depend on two main processes. First the potential of metals to bind paper pulp during manufacture. Second, the metal potential to migrate from paper to food during storage and use.Binding and unbinding processes are modelled for cadmium kinetics through kinetic approaches.The cadmium concentration in paper pulp is estimated from the cadmium concentration in the water–pulp liquor during manufacture, the temperature, and contact time. Two food simulants have been employed for desorption studies, water and acetic solution (3%, w/w). As expected, under acidic conditions desorption is total and rapid (close to 100% desorption reached in a few minutes). However, the desorption of cadmium into the neutral food simulant depends on the initial cadmium concentration in the paper pulp, temperature and contact time. Surface response curves for each combination are presented.Temperature did not affect cadmium binding, but played a significant role for the desorption processes into the neutral food simulant.The proposed equations offer a good fitting of the experimental values, with &lt;f&gt;p&lt;0.001&lt;/f&gt; and residuals within a factor of 3 for over 99% of the measured data. These models allow estimations of the expected exposure levels in consumers, on the basis of manufacture and use conditions. Linking the expected exposure with toxicity thresholds, such as the admissible daily intake (ADI), would allow a scientific assessment of the maximum acceptable cadmium levels in water–pulp liquors during manufacture and in the final paper pulp on the basic of the use patterns of each food packaging material. [Copyright &amp;y&amp; Elsevier]
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  Data: &lt;i&gt;Copyright of Chemosphere is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.chemosphere.2003.11.039
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 869
    Subjects:
      – SubjectFull: Metals
        Type: general
      – SubjectFull: Pulping
        Type: general
      – SubjectFull: Pollutants
        Type: general
      – SubjectFull: Cadmium
        Type: general
      – SubjectFull: Food packaging
        Type: general
    Titles:
      – TitleFull: Modelling the absorption and desorption of cadmium on paper pulp using kinetic approaches
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            NameFull: García-Gómez, C.
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            NameFull: Carbonell, G.
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            NameFull: Tarazona, J.V.
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            – D: 08
              M: 05
              Text: May2004
              Type: published
              Y: 2004
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              Value: 55
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            – TitleFull: Chemosphere
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