The application relates to the technical field of
coal sample analysis, in particular to a method and device for determining a critical difference of 3mm storage and inspection
coal sample inter-laboratory comparison, wherein the method comprises the following steps: taking a
dry basis as a reference, respectively determining detection difference values of 0.2mm analysis samples prepared by a sending laboratory and a receiving laboratory, and calculating a 1.2T value according to detection items and index ranges, wherein T is a reproducibility critical difference specified in a corresponding detection standard; and comparing the detection difference values with the 1.2T value, wherein if the detection difference value is less than or equal to the 1.2T value, it is determined that the 3mm storage and inspection
coal sample inter-laboratory comparison is qualified, otherwise, it is determined that the 3mm storage and inspection coal sample inter-laboratory comparison is unqualified. Therefore, the method solves the problems that related technologies use a square root of 3T as a critical difference of 3mm storage and inspection coal sample inter-laboratory comparison, the allowed range is widened, most of the comparison samples can pass the determination, and the sensitivity of the comparison result to detection abnormalities and quality fluctuations is reduced.