LaMotte SMART3 Soil Operator's Manual page 82

Colorimeter

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NEUTRALIZATION OF SOIL FILTRATE

In the test procedures for Ammonia Nitrogen, Calcium & Magnesium, Copper, Iron,

Manganese and Zinc require that the acidity of the soil extract be neutralized before the

test procedure is performed. This is done by adding *Sodium Hydroxide, 15% (7886) to

the soil extract until Bromthymol Blue Test Paper (2931) indicates that the pH is in the

proper range.

1. Add one drop of *Sodium Hydroxide, 15% (7886) to the soil extract. Stir with the

2. Touch the stirring rod to the Bromthymol Blue Test Paper (2931).

3. If the test paper does not change from yellow to blue or green, continue adding

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stirring rod.

*Sodium Hydroxide, 15% to the soil extract, one drop at a time. Stir and test the pH

after the addition of each drop until the test paper changes from yellow to green or

blue.

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SMART3 Soil Colorimeter 9.18

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