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Re: [APD] Using Sulphate of Potash in my tank

Stuart:

Fertilizer bags in the US state the source or composition of the fertilizer on the label. This is the way to tell what chemical or mineral is used as the source of the fertilizer.

Some math for anhydrous Potassium Sulphate, K2SO4:

2 x K: (39.0983)(2) = 78.1966
1 x S: (32.06)(1) = 32.06
4 x O: (15.9994)(4) = 63.9976

78.1966 / (78.1966 + 32.06 + 63.9976) = 0.4488 or 44.88 percent by weight Potassium in anhydrous pure Potassium Sulphate.

I have read different values for the percent of Potassium in Potassium Sulphate, and I don?t understand why there are differences, unless it is the purity of the salt. I have checked my math several times and don?t find a mistake. Potassium oxide is 83.01 percent Potassium by weight.

Jerry Smith
Bloomingdale, NJ


Date: Sat, 20 Sep 2008 14:58:42 +0100
From: Stuart Halliday <stuart at mytriops_com>
Subject: Re: [APD] Using Sulphate of Potash in my tank

My potash product says:
Analysis: Potassium Oxide (K2O) Soluble in water, 48.0% (39.9% K)

Stuart Halliday
http://mytriops.com/
200 Million years in the making...



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