Showing papers on "Color reaction published in 2018"

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.

Color recognition based quantitative measurement method for concentration of to-be-measured liquid

Abstract: The invention relates to the field of biological detection, in particular to a color recognition based quantitative measurement method for concentration of a to-be-measured liquid. The method comprises the following main steps: S4, locating information corresponding to a color reaction area and each color block with an image recognition technology, and converting diffuse reflection light information into color coordinates in specific color space; S5, equivalently reckoning diffuse reflection information of the color reaction area and the color blocks, environment illumination and other external factors into equivalent environment illumination on the basis of principles of optics; S7, calculating standard color of the color reaction area; S8, calculating the concentration of the to-be-measured liquid according to the corresponding relation between the standard color of the color reaction area and the concentration of the to-be-measured liquid, and outputting a result. Compared with theprior art, the color recognition based quantitative measurement method for the concentration of the to-be-measured liquid has the advantages that measurement errors caused by equipment and environmentfactors can be further corrected, measurement precision is improved, cost is reduced, and applicability is improved.

Estimation of Cr(III) in Water with the Presence of Cr(VI) by Chlorophosphonazo I Color Reaction Spectrophotometry.

Abstract: A method capable of accurately and selectively measuring Cr3+ in water is required and was therefore studied. The precision and reproducibility of chlorophosphonazo I color reaction spectrophotometry (CCRS) for the selective determination of Cr3+ was improved to be acceptable standards. The CCRS established is therefore an accurate, reproducible and inexpensive method. It also has reasonably good sensitivity and selectivity, and a high sample output. This method should be readily adapted for the routine and selective determination of Cr3+ in bottled mineral drinking water with (or without) the supplementation of Cr3+ or in natural water such as mineral or pipe water with the presence of Cr6+.

Method for detecting calcium content in dairy product

Abstract: The invention discloses a method for detecting calcium content in a dairy product. The method comprises the following steps: diluting the dairy product with a diluent to obtain a diluted solution; performing a color reaction on the diluted solution with a calcium reaction reagent to obtain a reaction product; and detecting the reaction product by use of a time-resolved fluorescence method, and comparing with a calcium calibrator solution processed in the same manner to calculate the calcium content of the sample, wherein the diluent contains 10-30% by mass of hydrochloric acid and 0.5% by massof Triton X-100. The method for detecting the calcium content in the dairy product can quickly and accurately detect the calcium content of the dairy product.

Method for detecting quaternary ammonium salt compounds in raw milk

Abstract: The invention discloses a method for detecting quaternary ammonium salt compounds in raw milk. The method comprises the following steps: (1) mixing the raw milk with ethanol, performing centrifugal treatment on the obtained mixture, and collecting a supernatant; (2) performing a color reaction on the supernatant to obtain an upper reaction liquid and a lower reaction liquid; (3) determining whether the raw milk contains the quaternary ammonium salt compounds on the basis of the color of the lower reaction liquid. Whether the raw milk contains the quaternary ammonium salt compounds can be detected rapidly, accurately, stably and conveniently with the method, so that reliable evidence is provided for evaluation of raw milk quality.

Detection of Mechanical Damaged Seeds in Soybean Using Color Reaction of Safranin Solution

Abstract: The present study was carried out with an aim to investigate the proper staining concentration and time of safranin solution to measure the mechanical damage in seeds of soybean crop. Two types of seed material were used i.e. processed and raw. Safranin chemical was used to measure the mechanical damage in both type of seed material with various concentrations i.e. Concentrate, 10%, 25% and 50%. The observations of the study indicate that for color reaction of 10% safranin solution for 10 minute was found most suitable to differentiate the damage and