Mobile smart device infrared light measuring apparatus, πmethod, and system for analyzing substances

A method for determining a concentration of one or more compounds in a liquid sample, comprising:

• placing the liquid sample on a sample tray,
• inserting the sample tray into a sample test port housed in a handheld device containing an infrared spectrometer, the infrared spectrometer including:
• an infrared light source and an infrared receiver positioned at opposite sides of the sample tray,
• an infrared calibration emitter and an infrared calibration receiver positioned at opposite sides of the sample tray;
• directing infrared light from the infrared light source at the sample and collecting the transmitted infrared light by the infrared receiver, thereby obtaining a sample spectrum;
• directing infrared light from the infrared calibration emitter and collecting the transmitted infrared light by the infrared calibration receiver, thereby obtaining a calibration spectrum;
• and
• determining the presence or concentration of one or more compounds in the liquid sample based on a comparison between the sample spectrum and the calibration spectrum.