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1¡¢To 2 mL of the test solution so obtained add 1.5 mL of a mixture of aliza-rin complexone TS, acetic acid-potassium acetate buffer solution, pH 4.3 and cerium (III) nitrate TS (1:1:1): blue-purple color develops.
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2¡¢octadecylsilanized silica gel Õâ¸öÔõô·­Òë
   

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