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1¡¢Fig 4: text merged for legend and x-axis test£¨¿ÉÄÜÉó¸åÈ˽«text´íд³ÉtestÁË£©¡£
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2¡¢From what mass is got back the PEX before precipitation by C2H5OH?
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3¡¢In the presence of NaOH, you obtain the sodic form of the PEX? It is necessary to specify by analysis with a photometer the quantity retained after synthesis.
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4¡¢It is necessary to measure the pH after extraction for every manipulation, to explain the mechanism of extraction.
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