Abstract：Spark discharge atomic emission spectrometer (Spark-AES) are equipped in many steel and iron enterprises in China. The original calibration curves of testing elements are prepared in the equipment in response to the needs of the user. After standardization and verification by the users on site, the instrument can be used for analysis. In the meantime, the appropriate verification samples are selected to monitor the measurement results at regular intervals. The monitoring interval usually depends on the stability of the instrument. Stability means the accuracy of the measurement results, i.e., the precision and trueness. The stability assessment methods for Spark-AES were designed. The target measurement time was divided into several time nodes. The proper standard sample for spectral analysis were selected and measured at each time node according to standard GB/T 4336-2016. Using the precision data given in the standard, the following five indicators were tested by precision, trueness criteria and χ2 statistics: the precision of the measurement data in each period (yi1-yi2), the trueness of the measurement data in each period (i-μ0), the repeatability of each period (s2rt), the total precision of each period (s2i) and the accuracy of the total mean value (-μ0). The criteria were evaluated step by step. During the evaluation of the first two indicators, the maximum group of consecutive data was retained. During the evaluation of the latter indicators, the final data were removed until the relevant test requirements were met. The minimum continuous stable time of each element was calculated according to the final data after collation, i.e., the upper limit of the stability time (TMAX) for the element at such content level. TMAX at all levels for all elements was used as the instrument's maximum stability time. The TMAX of the spectrometer used in the paper was 6 h. Any calculation was required for the instrument within this period. The monitoring of real-time test data was not required when the TMAX indicator was adopted in laboratory. The use of index to evaluate Spark-AES could save time and cost for the laboratory.
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