Tham khảo tài liệu 'wide spectra of quality control part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 230 Wide Spectra of Quality Control leached lead from glass packaging cannot exceed the prescribed limits of 5 mg dm3 for small hollow glass and mg dm3 for large glass under prescribed conditions. Table 9 compares the results from a measuring of the contents of soluble lead from glass packaging for the food industry under prescribed conditions using different stripping analysis techniques and the AAS technique as the referential technique prescribed by the standard Kalicanin et al. 2001a 2001b 2001c 2002 . Sample Cpb pg dm3 Analytical methods PSA PSA-iR AAS Bottle for fruit juice 1 dm3 of volume colorless Jar dm3 of volume colorless Jar dm3 of volume colorless Bottle for strong alcoholic drinks dm3 of volume of green color Table 9. Lead contents in the glassware for the food industry extracts by applying the PSA PSA-iR potentiometric stripping analysis with constant inverse current in the analytic step and AAS These results indicate that there is proper agreement between the contents obtained through the stripping techniques and AAS technique as the referential one. Figure 5 shows the content of the leached Pb from various packaging material which is used in the pharmaceutical industry during a period of 1 5 and 7 days. Most of the lead is leached from glass packaging of brown color and of greater volume. According to our research plastic packaging is more durable to the effects of an acidic medium. 24 hours 5 days 7 days Fig. 5. The content of leached lead from packaging for the pharmaceutical industry a glassware b plastic and metal depending on the duration exposure volume and color of the packaging 231 The Application of the Potentiometric Stripping Analysis to Determine Traces of M II Metals Cu Zn Pb and Cd in Bioinorganic and Similar Materials The use of the PSA in the quality control of dental-prosthetic material Dental-prosthetic material is very pure material of varying .
