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The Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1991

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4.4    REAGENTS

Sodium hydroxide solution, 30 g per 100 ml, ammonia free.

Sulphuric acid, 0.1 N solution.

Sodium or potassium hydroxide, 0.1 N solution, carbonate free.

for variant (a) (page 19)

Sulphuric acid, 0.2 N solution.

Sodium or potassium hydroxide, 0.2 N solution, carbonate free.

for variant (b) (page 19) (See Note on page 18)

Sulphuric acid, 0.5 N solution.

Sodium or potassium hydroxide solution, 0.5 N, carbonate free.

for variant (c) (page 19) (See Note on page 18)

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