Determination of lead in saline solution by using stripping potentiometry
การหาปริมาณตะกั่วในน้ำเกลือโดยวิธีวัดศักย์ไฟฟ้าคืนรูป
Roongroje Ratana-ohpas, School of Chemistry, Institute of Science, Walailuk U., Nakorn Si Thammarat
Waraporn Ratana-ohpas, D. of Chemistry, F. of Sci., PSU.
Doungkamol Songkongka, D. of Chemistry, F. of Sci., PSU.
Corresponding e-mail : doungkamol@hotmail.com
Presented : The 26th Congress on Science and Technology of Thailand, 18-20 October 2000,
Bangkok
Key words : stripping potentiometry, glassy carbon combined electrode,
vibrating sample drop, saline solution, lead
A simple and rapid method for the determination of lead in normal saline solution was devel-oped. Stripping potentiometry and the up-side-down combined electrode with a vibrating sample drop were used. It was found that the lower limit of detection was 0.3 mg L-1 and the linear working concentration range was approximately 0 to 2500 mg L-1. Lead in a normal saline solution can be determined in less than 10 minutes and the lead concentrations were found to be 40.52ฑ4.20 mg L-1
with the sensitivity around 3.3 ms L mg-1.
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