根据71天、31天以及新鲜配制的IS的PAR可以看出IS是有明显的降低

The 71 days, 31 days, and the IS PAR can be seen that freshly prepared IS be significantly reduced, and continues to repeat the stability test 71 days may fail, the solution stability is a comparative test for the stability of the test sample and dilution step and collection methods freshly prepared comparative samples are identical, if the presence of the analyte to the internal standard ion interference, they are simultaneously present, the results of the stability is not affected. Further 31 days internal standard working solution stability data is sufficient to use a subsequent sample analysis, each sample will be analyzed prior to confirm internal standard working solution has expired.

According to 71 days, 31 days and freshly formulated IS PARCans can be seen that IS is significantly reduced, continue to repeat 71 days of stability test may fail, solution stability is a comparative test, for stability test samples and freshly formulated comparison sample dilution steps and collection methods are exactly the same, If there is an ion-to-interference to the inner subject, they also exist at the same time, and the result of stability has no effect. Another 31 days of internal standard working fluid stability data is sufficient for subsequent sample analysis, before each sample analysis will be to confirm whether the internal standard operating fluid expires.

According to the par of 71 days, 31 days and freshly prepared is, it can be seen that is has a significant reduction. It may fail to repeat the stability test for 71 days. The solution stability is a comparative test. The dilution steps and collection methods for the stability test sample and freshly prepared comparative sample are exactly the same. If there is interference of the tested object with the ion pair of internal standard, they may fail It also exists at the same time and has no effect on the stability. In addition, the stability data of internal standard working solution for 31 days is enough for subsequent sample analysis. Before each sample analysis, we will confirm whether the internal standard working solution is expired.<br>