Method 958.02

Potassium in Fertilizers

This method is for the determination of potassium in fertilizer.  The sample is digested with ammonium oxalate, (NH4)2C2O4 and hdyrogen peroxide, H2O2.  The sample is titrated with BAC solution (benzylalkonium chloride) using a sodium tetraphneylboron (STPB) indicator to measure the potassium.



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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   None specified in the method.
Preservatives:   None specified in the method.
Required Preps:   50g of sample in a Glass or plastic bottle with Teflon-lined lid
Collection Method:   Grab sampling
Analytical Methodology:   Titration

Analyte List*

Analyte Formula CAS Number Detection Limit

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.