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The quality of the sample directly affects the test results. Representative samples should be selected in accordance with the requirements of the testing institution - for instance, liquid chemicals need to be thoroughly shaken before sampling, and solid samples should be mixed samples drawn from different batches and different parts. At the same time, ensure that the sample packaging is clean, sealed, and clearly labeled (including sample name, batch, sampling date, submitting unit, etc.) to avoid sample contamination, deterioration or information confusion, and ensure that the test samples can truly reflect the quality status of the entire batch of chemical products.

Give priority to institutions that hold authoritative qualification certifications such as CMA and CNAS and have rich experience in the field of chemical product testing. Such institutions are equipped with professional testing equipment (such as high-performance liquid chromatographs, atomic absorption spectrophotometers, etc.) and senior technical teams, and are proficient in various testing methods. For instance, in the detection of high-purity pharmaceutical intermediates, qualified institutions can precisely control detection errors, prevent distortion of test results due to insufficient institutional capabilities, and enhance the success rate of detection.

During the testing process, it is necessary to maintain smooth communication with the testing institution. If the institution discovers any abnormality in the sample (such as the appearance not matching the description or insufficient sample quantity), it should respond immediately, provide supplementary explanations or send additional samples. If you have any questions about the progress of the inspection, you can ask regularly but avoid overly interfering with the inspection process. For instance, when abnormal peaks of impurities are detected during the inspection, provide the production process information of the raw materials in a timely manner to assist technicians in identifying the cause and prevent the inspection from coming to a standstill.

After receiving the test report, carefully check the report information (such as sample information, test items, result data, standard basis, etc.). If there are any doubts about the results (such as abnormal data, incorrect units), a review application should be submitted within the prescribed time limit. At the same time, compare the test results with your own quality standards. If the results are qualified, keep the report for subsequent traceability. If the product is not up to standard, optimize the procurement or production process in combination with the analysis suggestions in the report (such as inferring the source of impurities). Form a quality control closed loop through review and application, and indirectly increase the success rate of subsequent testing.