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Topic: Gold Reduction By Sodium Borohydrate.  (Read 3653 times)

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Offline kino

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Gold Reduction By Sodium Borohydrate.
« on: August 17, 2011, 02:03:42 AM »
I'm doing gold reduction by using sodium borohydrate as the reducing agent.

Under room temperature, the 20ml 1.0mM HAuCl4 is placed on the stir plate, 0.5ml of 1% NaBH4 is added into it.

It showed a little dark violet for 1 second, then the solution turns into clear light yellow color in the end.

Is this correct, or it should be like the citrate reduction, in dark ruby red color?

Please help.

Offline DevaDevil

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Re: Gold Reduction By Sodium Borohydrate.
« Reply #1 on: August 17, 2011, 01:47:02 PM »
gold (I) chloride is yellow, so you most likely have a partial reduction

only gold nanoparticles in solution are red; it gets more yellow for particles larger than ~100 nm

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