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Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter13: The Chemistry Of Solutes And Solutions
Section13.6: Expressing Solution Composition
Problem 13.7PSP
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Case Study 1: Recently, our research group in the Department have developed a simple, quick and portable analytical method for the detection of Pb2+ (a toxic heavy metal) in aqueous solutions. It is based on the fluorescent properties of the nanomaterials known as carbon quantum dots (CQD). These nanomaterials are highly soluble in water and in aqueous solutions, they emit blue-green light when irradiated with an ultraviolet light (from a UV lamp or laser diode). In the presence of Pb²+, the intensity of the light emitted by CQD decreases, and the decrease of intensity of fluorescence is related to the concentration of Pb²+. In this method, the intensity of emitted light is measured by taking a photograph of the fluorescent test sample using a smartphone camera (Iphone 8) and then determining using an image analysis software the value of image pixel variables that are related to the intensity of the blue-green light emitted by the sample. 10) Research on how a digital camera (such as in smartphone) works, particularly, how it can record an image in a pixel. Using the concepts and principles that you've learned, concisely discuss how the smartphone camera is used in theinstrumental method described in Case Study 1. Specifically, describe how it can be used to obtain the desired chemical information about the analyte.
Transcribed Image Text:Case Study 1: Recently, our research group in the Department have developed a simple, quick and portable analytical method for the detection of Pb2+ (a toxic heavy metal) in aqueous solutions. It is based on the fluorescent properties of the nanomaterials known as carbon quantum dots (CQD). These nanomaterials are highly soluble in water and in aqueous solutions, they emit blue-green light when irradiated with an ultraviolet light (from a UV lamp or laser diode). In the presence of Pb²+, the intensity of the light emitted by CQD decreases, and the decrease of intensity of fluorescence is related to the concentration of Pb²+. In this method, the intensity of emitted light is measured by taking a photograph of the fluorescent test sample using a smartphone camera (Iphone 8) and then determining using an image analysis software the value of image pixel variables that are related to the intensity of the blue-green light emitted by the sample. 10) Research on how a digital camera (such as in smartphone) works, particularly, how it can record an image in a pixel. Using the concepts and principles that you've learned, concisely discuss how the smartphone camera is used in theinstrumental method described in Case Study 1. Specifically, describe how it can be used to obtain the desired chemical information about the analyte.
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