# Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996, Paragraph 4: REAGENTS


Hydrochloric acid solution, about 6 M
4.1 See Method 26d (4.1).
Hydrochloric acid solution, about 0.5 M
4.2 See Method 26d (4.2).
4.3 Hydrogen peroxide solution (30% H2O2 ρ = 1.11 g/ml) free from trace elements.
Lanthanum salt solutions (10 g of La per litre)
4.4 See Method 26d (4.3).
Iron calibration solution
4.5 Iron stock solution (1000 μg/ml)
4.5.1 In a 500 ml beaker, weigh to the nearest 0.1 mg, 1 g of pure iron wire, add 200 ml of 6 M hydrochloric acid (4.1) and 15 ml of hydrogen peroxide solution (4.3). Heat on a hotplate until the iron is completely dissolved. When cool, transfer quantitatively to a 1 litre volumetric flask. Make up to volume with water and mix thoroughly.
Iron working solution (100 μg/ml)
4.5.2 Place 20 ml of the stock solution (4.5.1) in a 200 ml volumetric flask. Make up to volume with the 0.5 M hydrochloric acid solution (4.2) and mix thoroughly.

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Source: https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/26h./paragraph/4 (the official version)
Page: https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-26h./paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.