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7Â¥: Originally posted by yzm869475747 at 2015-03-12 21:21:49
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bainaling: ½ð±Ò+5, ¡ïÓаïÖú 2015-03-11 20:36:39
תÌù£¬ÐÅÏ¢À´×ÔEugeniusz Małkowski (University of Silesia in Katowice), Ï£ÍûÓаïÖú£¬
Lead is one of the most difficult metal to investigate in laboratory experiments, because it very easily precipitates or forms complex ions. I conducted a large number of experiments with Pb and observed many unique chemical properties of this metal.
1. Effect of pH
I observed precipitation of Pb when pH of solutions was higher than 6.1-6.3. I observed this process even if I dissolved in the water only salt of Pb (PbCl2 or Pb(NO3)2, without any other chemical compounds. This precipitation is connected with Hydrolysis and can be easily overlooked if concentration of Pb is lower than 0.5-1.0 mM.
Conclusion: If pH of your LB media was above 6.1-6.3. most of Pb could precipitate. If you want to conduct experiments with lead pH of nutrient solutions or any media has to be maximum 5.9-6,0
2. Effect of phosphates
Lead very easy and quickly precipitates with phosphates and this reaction is observed irrespective of pH of solution. The product of this precipitation is not Pb3(PO4)2 but different types of pyromorphites, for example Pb5(PO4)3Cl. All pyromorphites are almost insoluble compounds. The formation of pyromorphites is connected with a large drop of pH of nutrient solution or media, which depends on the concentration of Pb salts (a higher concentration of Pb the higher drop of pH) and buffering capacity of solution. Plant physiologist use complete nutrient solutions to grow plants and for a treatment with Pb (one to several days) phosphates are removed from both control solutions and experimental (with Pb) solutions.
Conclusion: Use of phosphate buffer in experiments with Pb is not acceptable, because even all Pb can be precipitated. However, it could be possible to use the standard media, but for the time of treatment with Pb phosphates have to be removed from the media.
3Â¥2015-03-11 20:11:41
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3Â¥: Originally posted by tomjena2015 at 2015-03-11 20:11:41
תÌù£¬ÐÅÏ¢À´×ÔEugeniusz Małkowski (University of Silesia in Katowice), Ï£ÍûÓаïÖú£¬
Lead is one of the most difficult metal to investigate in laboratory experiments, because it very easil ...

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