Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (8): 1621.doi: 10.7503/cjcu20180868
• Analytical Chemistry • Previous Articles Next Articles
ZHOU Yuting,TANG Yujiao,SHAO Shuang,DAI Shiyan,CHENG Guifang(),HE Pingang,FANG Yuzhi
Received:
2018-12-27
Online:
2019-08-10
Published:
2019-07-12
Contact:
CHENG Guifang
E-mail:gfcheng@chem.ecnu.edu.cn
Supported by:
CLC Number:
TrendMD:
ZHOU Yuting, TANG Yujiao, SHAO Shuang, DAI Shiyan, CHENG Guifang, HE Pingang, FANG Yuzhi. Simultaneous Detection of Mercury, Lead and Strontium Ions Based on Conformational Conversion Sensor †[J]. Chem. J. Chinese Universities, 2019, 40(8): 1621.
Fig.3 DPV(A) and EIS(B) curves for bare PAA(a), PAA modified with oligonucleotide H1(b), the biosensor incubated with Hg2+(c) and then eluted by βME(d) Experimental conditions: 5×10-4 mol/L K3Fe(CN)6; 1×10-7 mol/L Hg2+; 1×10-8 mol/L βME.
Fig.4 Effect of the size of PAA nanopore on the differences of the current between before and after incubation with Hg2+ Experimental conditions: 5×10-4 mol/L K3Fe(CN)6; 1×10-7 mol/L Hg2+; 1×10-8 mol/L βME.
Fig.5 DPV curves of the entire detection process for PAA/H1/H2(a), incubated with the mixture of Hg2+, Pb2+ and Sr2+(b), eluted by βME(c), DOTA(d), and KP(e) Experimental conditions: 5×10-4 mol/L K3Fe(CN)6; 1×10-7 mol/L Hg2+; 1×10-7 mol/L Pb2+ and Sr2+; 1×10-8 mol/L βME; 1×10-7 mol/L DOTA and KP.
Eluent | Ion | k/(nmol·s-1) |
---|---|---|
βME | Hg2+ | 4.95×10-3 |
Pb2+ | 5.60×10-4 | |
Sr2+ | 7.29×10-4 | |
DOTA | Pb2+ | 3.10×10-3 |
Sr2+ | 6.11×10-4 | |
KP | Sr2+ | 2.16×10-3 |
Eluent | Ion | k/(nmol·s-1) |
---|---|---|
βME | Hg2+ | 4.95×10-3 |
Pb2+ | 5.60×10-4 | |
Sr2+ | 7.29×10-4 | |
DOTA | Pb2+ | 3.10×10-3 |
Sr2+ | 6.11×10-4 | |
KP | Sr2+ | 2.16×10-3 |
Fig.6 Specificity of the biosensor for the detection of Hg2+(A), Pb2+(B) and Sr2+(C) a. Zn2+; b. Sn2+; c. Cu2+; d. Mn2+; e. Ni2+; f. Co2+; g. Cd2+; h. Ca2+; i. Mg2+; j. F-; k. Cl-; l. NO 3 - ; m. SO 4 2 - ; n. Ac-; o. P O 4 3 - ; p. CO 3 2 - ; q. S2-; r. Pb2+; s. Sr2+; t. the mixture of all the co-existent ions; u. the solution contains 10.0 nmol/L Hg2+, Pb2+ and Sr2+. Experimental conditions: 5×10-4 mol/L K3Fe(CN)6; 1×10-8 mol/L βME; 1×10-7 mol/L DOTA and KP.
Fig.8 Calibration curves of the biosensor for the detection of Hg2+(A), Pb2+(B) and Sr2+(C) and linear relationships between the currents and the concentration of Hg2+(A'), Pb2+(B') and Sr2+(C')
Sample | Contentration of M2+/nmol | Recovery(%) | |||
---|---|---|---|---|---|
Ion | Original | Add | Found | ||
Tap water | Hg2+ | Not detected | 1.00 | 0.98 | 98 |
Pb2+ | Not detected | 1.00 | 1.11 | 111 | |
Sr2+ | Not detected | 1.00 | 1.08 | 107 | |
Drinking water | Hg2+ | Not detected | 1.00 | 0.90 | 90 |
Pb2+ | Not detected | 1.00 | 0.93 | 93 | |
Sr2+ | Not detected | 1.00 | 1.03 | 103 | |
River water | Hg2+ | 0.04 | 1.00 | 1.16 | 112 |
Pb2+ | Not detected | 1.00 | 0.97 | 97 | |
Sr2+ | 0.16 | 1.00 | 1.11 | 95 |
Sample | Contentration of M2+/nmol | Recovery(%) | |||
---|---|---|---|---|---|
Ion | Original | Add | Found | ||
Tap water | Hg2+ | Not detected | 1.00 | 0.98 | 98 |
Pb2+ | Not detected | 1.00 | 1.11 | 111 | |
Sr2+ | Not detected | 1.00 | 1.08 | 107 | |
Drinking water | Hg2+ | Not detected | 1.00 | 0.90 | 90 |
Pb2+ | Not detected | 1.00 | 0.93 | 93 | |
Sr2+ | Not detected | 1.00 | 1.03 | 103 | |
River water | Hg2+ | 0.04 | 1.00 | 1.16 | 112 |
Pb2+ | Not detected | 1.00 | 0.97 | 97 | |
Sr2+ | 0.16 | 1.00 | 1.11 | 95 |
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