Iodide Selective Electrodes Based on Bis(2-mercaptobenzothiazolato) Mercury(II) and Bis(4-chlorothiophenolato) Mercury(II) Carriers
Abstract
:Introduction
Experimental
Reagents
Preparation of electrodes
Apparatus and potential measurement
Results and discussion
Complex | Log K1 | Log K2 | Log K3 | Log K4 |
---|---|---|---|---|
HgI42− | 12.9 | 11.0 | 3.8 | 2.3 |
HgBr42− | 9.0 | 8.3 | 1.4 | 1.3 |
HgCl42− | 6.7 | 6.5 | 0.9 | 1.0 |
Influence of the membrane composition
Properties | Values / Range | |
---|---|---|
Hg(MBT)2 | Hg(CTP)2 | |
Optimized membrane composition (% by weight) | PVC (31.0), DBP (61.9), Hg(MBT)2 (5.0), MTOAC (2.1) MTOAC/Hg(MBT)2 mole ratio = 0.55 | PVC (30.9), DOP (61.8), Hg(CTP)2 (5.0), MTOAC (2.3) MTOAC / Hg(CTP)2 mole ratio = 0.56 |
Electrode type | Coated-graphite (solid contact) electrode | |
pH range | 3.5−11 for both electrodes | |
Conditioning time | at least 18 h in 0.05 M KI | |
Linear range (I−, M) | 1×10−6 -1×10−1 | 1×10−6 -1×10−1 |
Slope (mV/decade) | −57.6 | −58.4 |
Detection limit (M) | 4×10−7 | 6×10−7 |
Standard deviation of slope (within electrode variation, mV/decade) | ± 0.8 | ± 1.4 |
Standard deviation of slope (between electrode variation, RSD%) | ||
during 15 days in: 0.05 M KI | ± 1.7 | |
ambient air | ± 2.3 | |
distilled water | ± 3.8 | |
during 1 month in: 0.05 M KI | ± 2.5 | |
ambient air | ± 3.5 | |
distilled water | ± 4.3 | |
Response time (s) | ≤ 10 | ≤ 10 |
Response characteristics and selectivity of the electrodes
Analytical applications
LogKSCN,i | ||||
---|---|---|---|---|
Hg(MBT)2 | Hg(CTP)2 | |||
Ion | FIM | SSM | FIM | SSM |
Perchlorate | −2.57 | −3.15 | −2.45 | −2.85 |
Salicylate | −4.12 | −4.62 | −3.98 | −4.36 |
Phosphate | −4.52 | −4.18 | −4.49 | −4.35 |
Azide | −4.27 | −3.65 | −4.33 | −3.84 |
Oxalate | −4.65 | −4.76 | −4.70 | −4.78 |
Bromide | −3.05 | −2.42 | −3.15 | −2.49 |
Chloride | −3.58 | −3.34 | −3.83 | −3.48 |
Carbonate | −3.98 | −4.67 | −4.05 | −4.75 |
Nitrate | −4.83 | −4.86 | −4.78 | −4.93 |
Nitrite | −4.75 | −4.83 | −4.88 | −4.92 |
Sulfate | −4.52 | −4.46 | −4.35 | −4.75 |
Thiocyanate | −2.47 | −1.18 | −2.43 | −1.22 |
Acetate | −4.78 | −4.72 | −4.53 | −4.86 |
Fluoride | −3.62 | −3.75 | −3.75 | −3.96 |
Conclusions
Sample | Iodide added | Iodide found Hg(MBT)2 | Iodide found Hg(CTP)2 |
---|---|---|---|
1. (Tap Water) | − | ND | ND |
8.0×10−6 | (8.35 ± 0.38) ×10−6 | (8.41 ± 0.41) ×10−6 | |
1.6×10−5 | (1.49 ± 0.08) ×10−5 | (1.52 ± 0.0.07) ×10−5 | |
4.0×10−5 | (4.18 ± 0.18) ×10−5 | (4.20 ± 0.17) ×10−5 | |
8.0×10−5 | (8.28 ± 0.42) ×10−5 | (8.21 ± 0.40) ×10−5 | |
4.90×10−4 | (5.04 ± 0.06) ×10−4 | (5.06 ± 0.0.06) ×10−4 | |
4.76×10−3 | (4.77 ± 0.04) ×10−3 | (4.78 ± 0.0.09) ×10−3 | |
2. (Meglumine Compound) | (2.78 ± 0.14) ×10−3 * | (2.89 ± 0.16) ×10−3 | (2.66 ± 0.15) ×10−3 |
Acknowledgement
References
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Amini, M.K.; Ghaedi, M.; Rafi, A.; Habibi, M.H.; Zohory, M.M. Iodide Selective Electrodes Based on Bis(2-mercaptobenzothiazolato) Mercury(II) and Bis(4-chlorothiophenolato) Mercury(II) Carriers. Sensors 2003, 3, 509-523. https://doi.org/10.3390/s31100509
Amini MK, Ghaedi M, Rafi A, Habibi MH, Zohory MM. Iodide Selective Electrodes Based on Bis(2-mercaptobenzothiazolato) Mercury(II) and Bis(4-chlorothiophenolato) Mercury(II) Carriers. Sensors. 2003; 3(11):509-523. https://doi.org/10.3390/s31100509
Chicago/Turabian StyleAmini, Mohammad K., Mehrorang Ghaedi, Ali Rafi, Mohammad. H. Habibi, and Morteza M. Zohory. 2003. "Iodide Selective Electrodes Based on Bis(2-mercaptobenzothiazolato) Mercury(II) and Bis(4-chlorothiophenolato) Mercury(II) Carriers" Sensors 3, no. 11: 509-523. https://doi.org/10.3390/s31100509