MICRO QUANTITATIVE ANALYSIS REAGENT LIQUID OF LEAD CONTENT IN LEAD-FREE SOLDER, AND COLORIMETRIC METHOD

摘要

PPROBLEM TO BE SOLVED: To solve the problem, wherein, though analysis using an atomic absorption photometer is mainly performed hitherto when examining a lead content in solder, and ICP data by the atomic absorption photometer are required as analysis data even in an RoHS command, since the analysis has high analysis accuracy and reliability, the expensive atomic absorption photometer is necessary and a long time and much cost are required for measurement, and real-time examination of the lead content in a solder vessel in a mounting line is impossible. PSOLUTION: Disposal tubes (five or more) having respectively a size of 2 ml storing 1 ml of TPPS reagent solution having a concentration of 0.04% which is found as the optimum concentration by a concentration change of the TPPS reagent and each standard solder having the lead content of 0.05%-0.1% stored in an aluminum laminate bag are prepared in the test. A sample and three kinds of standards selected properly are put into the disposal tubes storing reagent liquid simultaneously in the same condition, and a reaction is accelerated by ultrasonic vibration. Each color of the reagent liquid in each disposal tube is compared, to thereby determine the lead content in the solder. PCOPYRIGHT: (C)2007,JPO&INPIT