Preparation of Iron Standard Solutions
Iron Standard Solution (0.1% Fe):Dissolve 0.100 g of Fe in the smallest amount necessary of a mixture of equal volumes of hydrochloric acid and water and dilute to 100.0 mL with water.
Iron Standard Solution (250 ppm Fe):
Immediately
before use, dilute with water to 40 times its volume a solution containing
4.840 g of ferric chloride in a 150 g/l solution of hydrochloric acid diluted
to 100.0 mL.
Iron Standard Solution (20 ppm Fe):
Immediately
before use, dilute with water to 10 times its volume a solution containing ferric
ammonium sulfate equivalent to 0.863 g of FeNH4(SO4)2,12H2O
and 25 mL of dilute sulfuric acid in 500.0 mL.
Iron Standard Solution (10 ppm Fe):
Immediately
before use, dilute with water to 100 times its volume a solution containing ferrous
ammonium sulfate equivalent to 7.022 g
of Fe(NH4)2(SO4)2,6H2O
and 25 mL of dilute sulfuric acid in 1000.0 mL.
Iron Standard Solution (8 ppm Fe):
Immediately
before use, dilute with water to 10 times its volume a solution containing 80
mg of iron and 50 mL of hydrochloric acid (220 g/l HCl) in 1000.0 mL.
Iron Standard Solution (2 ppm Fe):
Immediately
before use, dilute iron standard solution (20 ppm Fe) to 10 times its volume
with water.
Iron Standard Solution (1 ppm Fe):
Immediately before use, dilute iron standard solution (20
ppm Fe) R to 20 times its volume with water.
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