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Paragraph 4 REAGENTS

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Hydrochloric acid solution, about 6 M

4.1

See Method 25d (4.1).

Hydrochloric acid solution, about 0.5 M

4.2

See Method 25d (4.2).

Lanthanum salt solutions (10 g of La per litre)

4.3

See Method 25d (4.3).

Manganese calibration solutions

4.4

Manganese stock solution (1000 μg/ml)

4.4.1

In a 250 ml beaker, weigh to the nearest 0.1 mg, 1 g of manganese, add 25 ml of 6 M hydrochloric acid solution (4.1). Heat on a hot plate until the manganese is completely dissolved. When cool, transfer quantitatively to a 1000 ml volumetric flask. Make up to volume with water and mix thoroughly.

Manganese working solution (100 μg/ml)

4.4.2

Place 20 ml of the stock solution (4.4.1) in a 200 ml volumetric flask. Make up to volume with the 0.5 M hydrochloric acid solution (4.2) and mix thoroughly.