Color reaction

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

Chitinovorin-c and its preparation

Abstract: NEW MATERIAL:Chitinovorin-C shown by the formula and its salt. Showing the following physical and chemical properties (all are measured by Na salt except molecular weight). Molecular weight: 416. Solubility: soluble in water or dimethyl sulfoxide, slightly soluble or insoluble in methanol, ethanol, acetone, chloroform, or ethyl acetate. Color reaction: positive in ninhydrin reaction, or Sakaguchi reaction. Appearance: colorless powder. An acidic substance having amphoteric properties, etc. USE:An antibacterial agent against Gram-positive and Gram-negative bacteria, and a raw material for a novel antibiotic containing formylamino group. PREPARATION:A strain such as Flavobacterium chitinovorum (FERM-P 7085), etc. belonging to the genus Flavobacterium is cultivated in a medium preferably at 5.5-8.5pH at 25-32 deg.C for 20-80hr.

Utilization of 2-Nitro-6-(thiazol-2-yldiazenyl)phenol for Spectrophotometric Determination of Trace Amounts of Copper(II) in Water Samples

Abstract: A simple ultra sensitive and fairly selective non extractive spectrophotometric method for the determination of copper using 2-nitro-6-(thiazol-2-yldiazenyl) phenol (NTDP) has been developed.. The method is based on the color reaction of copper with NTDP at pH 7.1 buffer. The optimal reaction conditions (e.g., reagent concentration, pH and effect of time and temperature) were studied and the analytical characteristics of the method (e.g., limit of detection, limit of quantification, and linear ranges) were obtained. Linearity was obeyed in the range of 0.1-5.0 µg/mL of copper(II) ion and the detection limit of the method was 3.0 ng/mL. The relative standard deviation (RSD) and relative error for six replicate measurements of 2.0 µg/mL Cu(II) were 0.76 % and 1.34 %, respectively. The interference effect of some anions and cations was also tested. The method was applied to the determination of copper(II) in water samples.

Fluorescence Quenching Reaction of Selenium(IV)-Iodide-Rhodamine B System for Determination of Trace Amounts of Selenium

Abstract: We have studied the colour reaction of selenium (Ⅳ) with iodide and rhodamine B (RhB) which has been used to determine selenium. Although it is one of the highest sensitive colour reactions for determining selenium(Ⅳ), its sensitivity is still not high enough for the determination of trace amounts of selenium in some biological or

Reagent for detecting heavy metal ions in printing and dyeing wastewater

Abstract: The invention discloses a reagent for detecting heavy metal ions in printing and dyeing wastewater. The reagent is characterized by comprising components of raw materials in parts by weight as follows: 30-40 parts of a HEPES buffer solution, 6-9 parts of ethylene diamine tetraacetic acid, 6-8 parts of ammonia water, 2-4 parts of a color developing agent, 2-4 parts of sodium sulfite, 3-5 parts of nanoscale ceramic powder, 3-5 parts of ammonium citrate, 1-3 parts of dimethylglyoxime, 2-4 parts of a surfactant and 3-5 parts of a solvent. The components of the reagent have a synergistic effect, the reagent is applied to large-scale screening detection of copper sulfate in wastewater as well as heavy metal cadmium in water samples and the like and is very applicable to basic level detection, the color developing agent is more sensitive in reaction when detecting whether the content of heavy metals exceed a standard or not, when the content of the heavy metals is lower than the limit specified by the national standard, color reaction still exists, the detection efficiency is higher, the content of the heavy metals in water can be preliminarily detected whenever and wherever possible, the detection sensitivity is high, operation is simple, the detection speed is high, and usage is convenient.