Color reaction

About: Color reaction is a research topic. Over the lifetime, 1194 publications have been published within this topic receiving 19579 citations.

A Miniaturized Colorimeter with a Novel Design and High Precision for Photometric Detection.

Abstract: Water quality detection plays an increasingly important role in environmental protection. In this work, a novel colorimeter based on the Beer-Lambert law was designed for chemical element detection in water with high precision and miniaturized structure. As an example, the colorimeter can detect phosphorus, which was accomplished in this article to evaluate the performance. Simultaneously, a modified algorithm was applied to extend the linear measurable range. The colorimeter encompassed a near infrared laser source, a microflow cell based on microfluidic technology and a light-sensitive detector, then Micro-Electro-Mechanical System (MEMS) processing technology was used to form a stable integrated structure. Experiments were performed based on the ammonium molybdate spectrophotometric method, including the preparation of phosphorus standard solution, reducing agent, chromogenic agent and color reaction. The device can obtain a wide linear response range (0.05 mg/L up to 7.60 mg/L), a wide reliable measuring range up to 10.16 mg/L after using a novel algorithm, and a low limit of detection (0.02 mg/L). The size of flow cell in this design is 18 mm × 2.0 mm × 800 μm, obtaining a low reagent consumption of 0.004 mg ascorbic acid and 0.011 mg ammonium molybdate per determination. Achieving these advantages of miniaturized volume, high precision and low cost, the design can also be used in automated in situ detection.

Convenient colorimetric technique for detecting subaqueous polymorphic chlorine and its color comparator

Abstract: The present invention relates to a portable colorimetry for examining multiple-form chlorine in water and photoelectric color comparator thereof. The colorimetery employs the color reaction of DPD and sterilization chlorine agent in water to determining multiple-form chlorine content derived from sterilization chlorine agent, which includes employing glycine masking free chlorine, employing potassium iodide catalyzing and chemical combining chlorine to participate in color and employing phosphate buffer solution. The weight matched granule DPD, potassium iodide, EDTA and phosphate are packed into two reagent bags respectively, DPD and phosphate granules are packed in the reagent bag 2, DPD, potassium iodide, EDTA and phosphate granules are packed in the reagent bag 3; the free chlorine inwater is determined by reagent in reagent bag 2, the total chlorine in water is determined by reagent in reagent bag 3, and then the chemical combination chlorine content is calculated. The colorimetry and photoelectric color comparator of the present invention can determine the surplus chlorine, total chlorine, combination chlorine, chlorine dioxide and chlorite salt in water immediately, rapidly and flexibly after sampling in site.