The stability of the internal standard stock solution (refrigerated storage/35 days) does not meet the acceptance criteria, and a confirmatory test is carried out, so this data is not used for reporting;
The stability of internal standard stock solution (refrigerated / 35 days) does not meet the acceptance standard, so confirmatory test is conducted, so this data is not used for reporting;
The stability (cold storage /35 days) of the internal standard stock solution does not meet the acceptance standard, and a confirmation test is conducted, so this data is not used for reporting;