Sulfur Test – An Interpretation

In February, 1986, Midwest Laboratories began analyzing soils for sulfur using ICAP (Inductively Coupled Argon Plasma) rather than turbidmetrically. Whereas colorimetrically we were measuring degree of turbidity (cloudiness of solution extract) to determine plant available SO4-S only, with the ICAP we are actually burning the sample to determine SO4-S and some organic fractions of sulfur.

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