A study of calcium ion-selective PVC membrane electrode based on neutral carrier N,n,n',n'-tetracyclo-3-oxapentanediamide (correction of oxapetanediamide).
A calcium ion-selective PVC membrane electrode based on neutral carrier n,n,n',n'-tetracyclohexyl-3-oxapetanediamide, using di-(2-ethylhexyl)phthalate as the plasticizer and potassium tetrakis (4-chlorophenyl) borate as the additive is reported in this paper. The ion selective membrane consists of 1 wt% of the Ca2+ selective ligand, 65 wt% of the plasticizer, 1 wt% of the additive and 33 wt% of poly (vinyl chloride) powder. The electrode has the linear response range of 2.0 x 10(-7)-10(-1) mol/L with the Nernstian slope of 28 mV/decade at 25 degrees C and the detection limit of 2.0 x 10(-8) mol/L. The response time of the calcium ion-selective electrode is as the concentration of calcium ion is rapidly shifted from 10(-5) to 10(-4) mol/L. The potential stability and reproducibility are good. The free calcium in blood serum was determined by the calcium ion-selective electrode with satisfactory results.
Ma
Y L
YL
Institute of Environmental Medicine, Tongji Medical University, Wuhan.
Rao
X H
XH
Zhong
S M
SM
Ren
S
S
Yu
T X
TX
Zhen
Q
Q
D002118:Calcium / Q000097:blood*; D003510:Cyclohexanes; D004566:Electrodes; D006801:Humans; D011143:Polyvinyl Chloride
D003510:Cyclohexanes; C077946:N,N,N',N'-tetracyclohexyl-3-oxapentanediamide; D011143:Polyvinyl Chloride; D002118:Calcium