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ÎÄÏ×ÖÆ±¸·½·¨£º A total of 50 mL of 2.8 mM aqueous trisodium citrate dihydrate solution
was added to 100 mL of 0.4 mM aqueous hydrogen hexachloroplatinate(IV) solution at room temperature. An amount of 10 mL
of 12 mM sodium borohydride was introduced dropwise with
vigorous stirring, and the pale yellow solution turned dark brown
in 5 min. The dark brown colloidal solution was stirred for 4 h and
stored in a refrigerator at 4 ¡ãC until ready for further use.

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