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The use of total ionic strength adjusting buffers in determining fluoride concentration in soil solutions by ion selective electrometry


, : The use of total ionic strength adjusting buffers in determining fluoride concentration in soil solutions by ion selective electrometry. Communications in Soil Science & Plant Analysis 24(15-16): 1865-1882

Total ionic strength buffers based on citrate at pH 7.5 and cyclohexylenediaminetetra-acetic acid (CDTA) at pH 5.2 were evaluated for use when determining fluoride (F) concentration in soil solutions. Both buffers achieved acceptable recoveries of F added to ultra-filtered (0.025 mu-m) solutions. Recovery of F added to unfiltered and 0.22 mu-m filtered solution was low when the CDTA buffer was used. This effect was attributed to the adsorption of F by micro-particulate materials present in these samples. The use of this buffer would need to be restricted to samples in which micro-particulates were not present. The performance of the citrate buffer was not affected by the presence of microparticulates; however, electrode response times, and departure from Nernstian response at low F concentrations, were greater when this buffer was employed. Fluoride was found to be present at low concentrations in the soil solution of the 60 virgin highly weathered soils tested. The F concentration in 75% of the surface samples was lt 3 mu-M, while all subsoil samples had soil solution F concentrations lt 1 mu-M.

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Accession: 002530668

DOI: 10.1080/00103629309368924

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