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- W2063919997 abstract "Abstract Determination of the extent to which plants can deplete nitrate from nutrient solutions (Cmin) has been hindered in the past by insufficiently sensitive assay techniques. Now ion chromatography on a Dionex AS4A column can be used to separate and quantitate as little as 5 pmoles nitrate (a sensitivity of 0.02 + 0.005 μM NO3 ‐[0.3 ppb NO3 ‐N]) in nutrient medium containing other anions in more than 105molar excess. To obtain this precision in actual depletion experiments, however, certain important precautions must be observed, including the avoidance of membrane filters with interfering extractables, i.e. all types tested. Under these conditions, other components of the medium do not interfere, nor apparently do root exudates. The sensitivity and absence of interference is compared with that of existing methods for nitrate estimation (nitrate electrode, salicylate, phenoldisulfonate, nitrate reductase/ nitrite diazotization, and ultraviolet absorption, alone, or coupled with high pressure liquid chromatography). The technique is used to demonstrate that pumpkins (Cucurbita moschataPoir.) growing in nutrient solutions can deplete nitrate at least to 0.16 μM, a concentration probably not measurable by any non‐chromatographic method, and measurable accurately at present only by the ion chromatography technique described here. Chloride uptake, and efflux, has also been measured simultaneously from the same chromatography profiles" @default.
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- W2063919997 date "1989-02-01" @default.
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- W2063919997 title "Ion chromatography in nutrient depletion studies: Measurement of very low nitrate concentrations" @default.
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- W2063919997 doi "https://doi.org/10.1080/00103628909368089" @default.
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