Screening Residue

Testing. The Technical Association of the Pulp and Paper Industry (TAPPl) gives test methods that are widely used by kaolin suppHers to the paper iadustry. These iaclude tests for viscosity, viscosity stabiUty, brightness, pH, particle size distribution, moisture content, and screen residue (12). 

For a long time there has been private, in-house quality research, especially in the biodynamic sector and by some larger organic traders and processors. These vary from crystallisation techniques to broad screen residue analyses of raw materials. These in-house quality management schemes are not standard they depend on how seriously the companies take their responsibility towards their clients and/or want to avoid surprises by the food authorities. 

Table 27.1 Microbiological Methods for Screening Residual Antibacterials in Milk... 

A semiautomated enzyme immunoassay was recently developed as a means to investigate the use of urine and bile as potential matrices for screening residues of sulfamethazine and sulfadiazine in swine (67). Urine was chosen as the screening matrix because sulfonamides are mainly excreted through this body fluid compared with urine, the levels of sulfonamides in plasma, serum, and bile drop relatively sharply after withdrawal. An extensive investigation was followed to compare the efficiency of sulfonamide-positive bile and urine at predicting sulfonamide-positive kidneys. Bile was found to be an extremely efficient predictor of... 

Immunochemical Methods Commonly Used for Screening Residues of Anabolics in Edible Animal... 

Due to the broad range of polarity characterizing the analytes, separations are achieved on stationary phases that possess different polar characters. Consequently, the open tubular columns with silicone polymer bonded phases that are used range from 100% methyl silicone or 95% methyl and 5% phenyl (apolar) to 50% methyl and 50% phenyl, 50% methyl and 50% trifluoromethylpropyl, 86% methyl and 14% phenylcyanopropyl, or 50% methyl and 50% phenylcyanopropyl (medium polar or highly polar). The primary choice with respect to the stationary phase for screening residues of pesticides is a low polarity one, either 100% methyl silicone or 95% methyl and 5% phenyl. 

Whittaker et al. [123] discuss the use of IRMS for screening residual heavy or weathered petroleum wastes. X ittaker et al. reported that the stable carbon isotope data allowed discrimination between different types of oils. 

Oil Absorption (% Gardnar-Coleman) 20-25 (% Spatula Rub-Out) 27-33 Median Particle Size (Microns) 8.8 Screen Residue (Max. % -f325 Mesh) 2.5 Siltax 44C ... 

Oil Absorption (% Gardner-Coleman) 17.0 pH (20% Solids) 11.0 Refractive Index 1.73 Hardness (Mohs Scale) 5.S-6.0 Specific Gravity 3.6 Density, Lbs./Solid Gallon 30.10 Bulking Value, Gallons/Lb. 0.0332 Screen Residue (% Retained on 325 Mesh) Resistivity (ohms-cm) 12,000... 

Spatula Rub-Out) Median Particle Size (Microns) 6.8 Screen Residue (Max. 

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