Abstract
(1) The basis of a gravimetric method for measuring mean air, soil or water temperatures (in the range 0 to 30 0C) over a period of days or weeks is described. (2) A known weight of potassium ethyl xanthate is allowed to hydrolyse in an aqueous buffer solution in a bottle, left in situ for the period of measurement, at the end of which nickel sulphate solution is added. This precipitates the remaining xanthate as the insoluble nickel salt; the mixture is then filtered at leisure in the laboratory. (3) The dry weight of material filtered off is converted to a corresponding mean temperature by reference to a calibration curve obtained at known, constant temperatures. (4) This procedure is more convenient than an established, analogous method employing the rate of inversion of sucrose solution, and is equally suited to studies involving temperature measurement at remote sites.
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