Abstract：The changes of factors such as environment in laboratory will lead to instrumental analysis error, which makes the measured results exceed the allowed limits. Therefore, it is necessary to measure the upper time limit of long-term stability of the measuring instrument. In experiments, three certified reference materials of stainless steel with different composition gradients were determined by spark discharge atomic emission spectrometry. The precision and trueness of determination results of C, Si, Mn, S, P, Cr, Ni, Mo,Cu, Ti, V and Co in each period, the precision within the period, the total precision between periods and the trueness of the total average value were analyzed. The results showed that the precision and trueness, repeatability within the period, general precision within the period and trueness of the total average value could meet the checking standard and statistical requirements within the following consecutive periods: 7.5, 7.0, 12.0, 8.0, 4.0, 7.5, 7.0, 14.5 and 10.0 h for C, Si, Mn, S, P, Cr, Ni, Cu and Ti, respectively, and 15.0 h for Mo, V and Co. Therefore, the upper time limit of long-term stability of the measuring instrument TMAX was 4.0 h. Through the long-term stability test, the use frequency of certified reference materials(CRMs) or control sample was reduced, which not only saved time and cost, but also was valuable for the quick analysis of on-the-spot samples.
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