Water Analysis for Sanitary Purposes, Chemical And Biological
Water Analysis for Sanitary Purposes, Chemical And Biological
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POISONOUS METALS.
Iron^ Lead and Copper. — Place two porce- lain evaporating dishes side by side in a good light. Into one pour loo c. c. of the water under examination. Into the other, lOO c. c. of water known to be free from iron, lead and copper. Add a drop of ammonium sulphide to each and stir with glass rods.
Compare the colors of the two waters. A dark coloration indicates the presence of one or more of the metals iron, lead and copper.
If a coloration is produced, add two or three drops ...of hydrochloric acid, HCl. A coloration due to iron sulphide disappears.
That due to copper or lead sulphide remains.
The presence of iron may be verified by add- ing a few drops of nitric acid, HNO3, to another 100 c. c. of the water and boiling thoroughly. Then add two or three drops of potassium sulphocyanate, KSCN. If iron is present, red ferric sulphocyanate will be formed.
Digitized by LjOOQ IC 46 If a coloration remains after adding the hydrochloric acid, -add about i c. c. of a strong solution of potassium cyanide, KCN.
What to read after Water Analysis for Sanitary Purposes, Chemical And Biological?
You can find similar books in the "Read Also" column, or choose other free books by Charles H Charles Herbert Clark to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
POISONOUS METALS.
Iron^ Lead and Copper. — Place two porce- lain evaporating dishes side by side in a good light. Into one pour loo c. c. of the water under examination. Into the other, lOO c. c. of water known to be free from iron, lead and copper. Add a drop of ammonium sulphide to each and stir with glass rods.
Compare the colors of the two waters. A dark coloration indicates the presence of one or more of the metals iron, lead and copper.
If a coloration is produced, add two or three drops ...of hydrochloric acid, HCl. A coloration due to iron sulphide disappears.
That due to copper or lead sulphide remains.
The presence of iron may be verified by add- ing a few drops of nitric acid, HNO3, to another 100 c. c. of the water and boiling thoroughly. Then add two or three drops of potassium sulphocyanate, KSCN. If iron is present, red ferric sulphocyanate will be formed.
Digitized by LjOOQ IC 46 If a coloration remains after adding the hydrochloric acid, -add about i c. c. of a strong solution of potassium cyanide, KCN.
What to read after Water Analysis for Sanitary Purposes, Chemical And Biological?
You can find similar books in the "Read Also" column, or choose other free books by Charles H Charles Herbert Clark to read onlineMoreLess
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