Measuring and testing – Sampler – sample handling – etc. – With heating or cooling
Patent
1997-12-05
1999-11-02
Larkin, Daniel S.
Measuring and testing
Sampler, sample handling, etc.
With heating or cooling
73866, 422 681, G01N 3324
Patent
active
059748990
ABSTRACT:
An improved method of extracting nutrients from soil samples using hot water. The improved method utilizes an expresso coffee machine to force hot water through soil samples to which no filler materials such as silica sand has been added. Tests were performed with an expresso machine that generates a pressure of 2.5 bar and a temperature of 93.degree. C. The method was performed with the following steps. Soils to be tested were air dried at a maximum temperature of 25.degree. C. and passed through a 2.0 mm (number 10 mesh) screen. A 5.0-gram soil sample was placed in the expresso machine filter basket, which was lined with a 5.50-cm diameter medium filter paper. 100 ml of distilled water was placed in the expresso machine's boiler, and allowed to heat for 2.0 minutes. The heated water was released and passed through the soil sample until the boiler was empty and the filter basket without surface water. Extraction aliquots were allowed to cool. 10 ml samples from the extraction aliquots were tested for nitrate, phosphorus, sulfate, and potassium content, as well as for nitrate clarity and pH. Measured values correlated well with those obtained using standard nutrient extraction techniques.
REFERENCES:
patent: 5526705 (1996-06-01), Skotnikov et al.
patent: 5672813 (1997-09-01), Doherty
Hot water percolation (HWP): A new rapid soil extraction method Gy. Fuleky and I. Czinkota, Plant and Soil 157: 131-135, 1993.
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