Determination of Heavy Metal Ions in Infant Milk Powder Using a Nanoporous Carbon Modified Disposable Sensor

Han Chen; Yao Yao; Chao Zhang; Jianfeng Ping

doi:10.3390/foods12040730

Determination of Heavy Metal Ions in Infant Milk Powder Using a Nanoporous Carbon Modified Disposable Sensor

Foods. 2023 Feb 7;12(4):730. doi: 10.3390/foods12040730.

Authors

Han Chen¹, Yao Yao¹, Chao Zhang¹, Jianfeng Ping¹

Affiliation

¹ Laboratory of Agricultural Information Intelligent Sensing, School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.

Abstract

Due to the risk of heavy metal pollution in infant milk powder, it is significant to establish effective detection methods. Here, a screen-printed electrode (SPE) was modified with nanoporous carbon (NPC) to detect Pb(II) and Cd(II) in infant milk powder using an electrochemical method. Using NPC as a functional nanolayer facilitated the electrochemical detection of Pb(II) and Cd(II) due to its efficient mass transport and large adsorption capacity. Linear responses were obtained for Pb (II) and Cd(II) in the range from 1 to 60 µg L^-1 and 5 to 70 µg L^-1, respectively. The limit of detection was 0.1 µg L^-1 for Pb(II) and 1.67 µg L^-1 for Cd(II). The reproducibility, stability, and anti-interference performance of the prepared sensor were tested as well. The heavy metal ion detection performance in the extracted infant milk powder shows that the developed SPE/NPC possesses the ability to detect Pb(II) and Cd(II) in milk powder.

Keywords: electrochemical detection; heavy metal ions; milk powder; nanoporous carbon; stripping voltammetry.

Grants and funding

This work was supported by the National Program on Key Research Project of China (SQ2019YFE010999) as well as European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement No 861917-SAFFI.