Title of Oral/Poster Presentation

Smartphone-based optode sensor for calcium and magnesium continuous detection in water

Presenter Information

Wei ZhangFollow

Class

Article

Graduation Year

2019

College

College of Engineering

Department

Biological Engineering Department

Faculty Mentor

Anhong Zhou

Presentation Type

Oral Presentation

Abstract

Water hardness is closely linked to our daily life, which is usually quantified by calcium carbonate in water. Hard water may have moderate health benefit, but it can bring serious problem in industrial areas. In this paper, a rapid-response, reliable and convenient device was developed to measure calcium and magnesium concentration in water sample continuously. It was based on phase extraction equilibria in the specific ion-exchange substance membrane, which contained ionophore (selectively binding to specific ions), chromoionophore (a lipophilic pH indicator), ionic salt (a cation exchanger), polymer (PVC) and plasticizer. The device was connected with Mitos pump and controlled by corresponding software. Smartphone was utilized to record the color change after sample flow over membrane and analyzed by Image J subsequently. The results showed that calcium concentration could be determined in acetate buffer solution (pH=5.3) with calcium ionophore and total hardness could be measured in Tris-HCl buffer solution (pH=7.2) with calcium ionophore. Both linear ranges covered normal water hardness (from soft to very hard). The results were verified by Hach water hardness kit and inductively coupled plasma mass spectrometry (ICPMS) as well. In conclusion, the novel developed optode device is capable to measure calcium and magnesium separately in long time period. It is promising to be used in resource-limited area and monitor water hardness in real time.

Location

Room 154

Start Date

13-4-2017 9:00 AM

End Date

13-4-2017 10:15 AM

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Apr 13th, 9:00 AM Apr 13th, 10:15 AM

Smartphone-based optode sensor for calcium and magnesium continuous detection in water

Room 154

Water hardness is closely linked to our daily life, which is usually quantified by calcium carbonate in water. Hard water may have moderate health benefit, but it can bring serious problem in industrial areas. In this paper, a rapid-response, reliable and convenient device was developed to measure calcium and magnesium concentration in water sample continuously. It was based on phase extraction equilibria in the specific ion-exchange substance membrane, which contained ionophore (selectively binding to specific ions), chromoionophore (a lipophilic pH indicator), ionic salt (a cation exchanger), polymer (PVC) and plasticizer. The device was connected with Mitos pump and controlled by corresponding software. Smartphone was utilized to record the color change after sample flow over membrane and analyzed by Image J subsequently. The results showed that calcium concentration could be determined in acetate buffer solution (pH=5.3) with calcium ionophore and total hardness could be measured in Tris-HCl buffer solution (pH=7.2) with calcium ionophore. Both linear ranges covered normal water hardness (from soft to very hard). The results were verified by Hach water hardness kit and inductively coupled plasma mass spectrometry (ICPMS) as well. In conclusion, the novel developed optode device is capable to measure calcium and magnesium separately in long time period. It is promising to be used in resource-limited area and monitor water hardness in real time.