Abstract
Soil water extractors that are presently used to sample the unsaturated zone cause substantial CO2 degassing within the sampler. The resultant pH errors are sufficiently large that the measured pH values are unacceptable for determining specific mineralogic controls on solution composition. The pH increases can also result in oxide and carbonate precipitation within the extractor thereby altering solution composition. The soil water samplers described here reduce CO2 degassing by minimizing the gas‐liquid ratio in the extractor and by flushing several volumes of solution through the liquid‐filled sampling container before a sample is removed. The construction of both shallow and deep samplers is described.
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