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A Soil Water Extractor That Minimizes CO 2 Degassing and p H Errors
Author(s) -
Suarez D. L.
Publication year - 1986
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr022i006p00876
Subject(s) - extractor , carbonate , soil water , sampling (signal processing) , flushing , environmental science , analytical chemistry (journal) , mineralogy , chemistry , soil science , environmental chemistry , process engineering , medicine , organic chemistry , filter (signal processing) , computer science , engineering , computer vision , endocrinology
Soil water extractors that are presently used to sample the unsaturated zone cause substantial CO 2 degassing within the sampler. The resultant p H errors are sufficiently large that the measured p H values are unacceptable for determining specific mineralogic controls on solution composition. The p H increases can also result in oxide and carbonate precipitation within the extractor thereby altering solution composition. The soil water samplers described here reduce CO 2 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.