Preparation of Cerium Zirconium Composite Oxide Modified Glassy Carbon Electrode and the Detection of Pb2+ in Water Samples

doi:10.19894/j.issn.1000-0518.210256

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (6): 990-999.DOI: 10.19894/j.issn.1000-0518.210256

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Preparation of Cerium Zirconium Composite Oxide Modified Glassy Carbon Electrode and the Detection of Pb²⁺ in Water Samples

Qin YANG, Ning-Hua CHEN, Yu-Jie ZHANG, Zhi-Xiang YE, Ying-Chun YANG()

Department of Resources and Environment，Chengdu University of Information Technology，Chengdu 610225，China

Received:2021-05-26 Accepted:2021-08-29 Published:2022-06-01 Online:2022-06-27
Contact: Ying-Chun YANG
About author:yangyingchun@cuit.edu.cn
Supported by:
the Science and Technology Department of Sichuan Province(2021ZHCG0020)

Abstract

Abstract:

Lead is a toxic heavy metal which is widely distributed in nature and affects the ecological environment and human health. Therefore， it is of significance to detect lead ions in the environment. In this paper， a modified glassy carbon electrode is fabricated by Ce₂Zr₂O_7.04 nanocomposites that are prepared by the hydrothermal method. Scanning electron microscope （SEM）， X-ray diffractometer （XRD） and X-ray photoelectron spectroscopy （XPS） are used to characterize the composition， morphology and valence state of the as prepared materials. Square wave anodic stripping voltammetry （SWASV） is applied to detect Pb²⁺， and it is found that the modified electrode has a good current response to Pb²⁺. Meanwhile， the examined conditions such as buffer solution， deoxidization time， enrichment potential and pH are optimized. The results show that the linear range of Pb²⁺ is 0.0025~3.5 μmol/L， the detection limit （LOD）（3S/N） is 0.198 nmol/L， and the recovery rate is between 97.6% and 104.4% under the optimized test conditions. The method used in the determination of Pb²⁺ in water samples manifests good reproducibility， stability and anti-interference ability， which provides a new method for the detection of Pb²⁺ in water samples.

Key words: Cerium zirconium compound oxide, Modified electrode, Lead ion （Pb²⁺）

CLC Number:

O657.1

Qin YANG, Ning-Hua CHEN, Yu-Jie ZHANG, Zhi-Xiang YE, Ying-Chun YANG. Preparation of Cerium Zirconium Composite Oxide Modified Glassy Carbon Electrode and the Detection of Pb²⁺ in Water Samples[J]. Chinese Journal of Applied Chemistry, 2022, 39(6): 990-999.

Figures/Tables 9

References 38

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样品 Sample	测量值 Detected/（μmol·L^-1）	加标量 Added/（μmol·L^-1）	测量总值 Found/（μmol·L^-1） ^a	相对标准偏差 RSD/% ^b	回收率 Recovery/%
牛奶 Milk	/	1.0	1.03	1.45	103.0
牛奶 Milk	/	2.5	2.44	1.20	97.6
矿泉水 Mineral water	/	1.0	1.02	1.29	102.0
矿泉水 Mineral water	/	2.5	2.59	1.31	103.6
自来水 Tap water	0.003 1	1.0	1.03	1.22	103.0
自来水 Tap water	0.003 1	2.5	2.61	1.19	104.4

样品 Sample	测量值 Detected/（μmol·L^-1）	加标量 Added/（μmol·L^-1）	测量总值 Found/（μmol·L^-1） ^a	相对标准偏差 RSD/% ^b	回收率 Recovery/%
牛奶 Milk	/	1.0	1.03	1.45	103.0
牛奶 Milk	/	2.5	2.44	1.20	97.6
矿泉水 Mineral water	/	1.0	1.02	1.29	102.0
矿泉水 Mineral water	/	2.5	2.59	1.31	103.6
自来水 Tap water	0.003 1	1.0	1.03	1.22	103.0
自来水 Tap water	0.003 1	2.5	2.61	1.19	104.4

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Preparation of Cerium Zirconium Composite Oxide Modified Glassy Carbon Electrode and the Detection of Pb²⁺ in Water Samples

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