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(1)��ʯ��ӺY:5A��,��60-80Ŀ��ܶ�1·41 g/cm3,��ѷe�ܶ�0·72 g/cm3,��Ϻ�ԇ��S��

(2)��ԇ�(y��n)ˮ:��1·354 g��(j��ng)��z��ָ��HgCl2��500 mlˮ��,��Ƴɺ��2000 mg/L��Һ,��ٜ�(zh��n)�_ϡጵ�10 mg/L��30 mg/L,��100 mg/L,��200 mg/L��300 mg/L,��ȸ��N�|(zh��)��,��

(3)��Һ:Na2EDTA 0.200 mol/L

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ÿ��ȡ300 mL��ԇ�(y��n)ˮ,��_��ķ��ӺY��20 min,��^�V,��ȡ�m��Һ�y��Ӌ��ȥ��,��

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