By studying the composition and principle of the titration of soil organic matter analyzers,the reasonable metrological characteristics are determined,and the metrological indicators such as temperature deviation,temperature uniformity,indication error and repeatability of the soil organic matter analyzers are calibrated.A calibration method with operability is compiled,and the measurement uncertainty of the calibration result is scientifically evaluated.In this way,a more advanced and practical calibration method can be formed,which has practical significance for standardizing this kind of instrument.
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