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• W1972618913 abstract "The ammonia loss through Nalophan bags has been studied. The losses observed for storage conditions and times as allowed by the reference standard for dynamic olfactometry (EN 13725:2003) indicate that odour concentration values due to the presence of small molecules may be significantly underestimated if samples are not analysed immediately after sampling. A diffusion model was used in order to study diffusion through the bag. The study discusses the effect of concentration gradient (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mi>Δ</mml:mi><mml:mi>C</mml:mi></mml:math>) across the polymeric membrane of the analyte. The<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mi>Δ</mml:mi><mml:mi>C</mml:mi></mml:math>was controlled by using a setup bag called “double bags.” Experimental data show a reduction of ammonia percentage losses due to the effect of the external multibarrier. The expedient of the double bag loaded with the same gas mixture allows a reduced diffusion of ammonia into the inner bag. Comparing the inner bag losses with those of the single bag stored in the same conditions (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mrow><mml:mi>T</mml:mi></mml:mrow></mml:math>,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M4><mml:mrow><mml:mi>P</mml:mi></mml:mrow></mml:math>,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M5><mml:mrow><mml:mi>u</mml:mi></mml:mrow></mml:math>) and with equal geometrical characteristics (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M6><mml:mi>S</mml:mi><mml:mo>/</mml:mo><mml:mi>V</mml:mi></mml:math>,<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M7><mml:mrow><mml:mi>z</mml:mi></mml:mrow></mml:math>), it was observed that the inner bag of the double bag displays a 16% loss while the single bag displays a 37% loss. Acting on the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M8><mml:mi>Δ</mml:mi><mml:mi>C</mml:mi></mml:math>it is possible to achieve a gross reduction of 57% in the ammonia leakage due to diffusion." @default.
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• W1972618913 date "2014-01-01" @default.
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• W1972618913 title "Ammonia Diffusion through Nalophan Double Bags: Effect of Concentration Gradient Reduction" @default.
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• W1972618913 doi "https://doi.org/10.1155/2014/214190" @default.
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