Chemical Pollutants in Air, Water, Soil, and Solid Wastes Phần 4 pptx

... terminal oxygen atom is replaced by a nitrogen atom. Triazine is a nitrogen heterocyclic ring containing three N atoms in the ring. NCO O (leaving group) R 1 R 2 1. Carbamate NCO O (leaving group) R 1 R 2 2. ... 3 ) occurs in v arying concentrations in groundwater, surface water, and waste water. Its occurrence in waters and sludge is primarily attributed to its formation...

... two end points commonly fixed in the determination of alkalinity are the pH 8.3 and pH 4. 5 (or between 4. 3 and 4. 9, depending on the test conditions). When the alkalinity is determined to pH ... such interference effect. Remove free chlorine in the sample by adding Na 2 S 2 O 3 solution. In addition, the presence of oxidizing and reducing agents in the...

... 1997 by CRC Press LLC © 1997 by CRC Press LLC Handbook of Environmental Analysis Chemical P ollutants in Air, Water, Soil, and Solid Wastes Pradyot Patnaik, Ph.D. LEWIS PUBLISHERS Boca ... therefore, important to examine the type of compounds that are to be analyzed and certain physical and chemical properties of these compounds. Information regarding the st...

... may be adhering to it. It is dried in an oven for several hours at 105°C, cooled in a desiccator, and weighed. Heating, cooling, and weighing is repeated until a constant weight is obtained. Alternately, ... From an analytical standpoint, phosphorus is classified into three main categories: 1. Orthophosphate, PO 4 3– , e.g., Na 3 PO 4 2. Condensed phosphate including meta-, pyro-,...

... Chloroformates and acidic substances (at high concentrations) may interfere in the test. • Detection limit: in the range 0.1 ppb. Air drawn through an impinger containing 4, 4 ′ -nitrobenzyl pyridine in ... XAD-2. • Monomethylamine interferes in the test; interference is removed by passing air through an impinger containing 0.5% CuCl 2 solution before drawing the air throu...

... manufacture of dyes and drugs; occurs in gasoline and petroleum solvents; colorless liquid with characteristic odor; boiling point for o-, m-, and p- isomers 144 .4, 139.1, and 138 .4 C, respectively; ... CONTAINERS, PRESERVATIONS, AND HOLDING TIMES Analyte Container Preservation Maximum holding time Inorganics and microbial tests Acidity P,G Cool, 4 C 14 d Alkalini...