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5600 metodo de organofosforados
Ernestina Pérez González
METHAMPHETAMINE and Illicit Drugs, Precursors, and Adulterants on Wipes by Solid Phase Extraction 9109
John Reynolds
Methamphetamine and various precursor and other drugs of abuse can be determined on surfaces by wipe sampling with methanol (preferably) wetted cotton gauze. Determination is by GC-MS after derivatization with a mixed reagent, MSTFA followed by MBHFBA.
NMAM 0500: PARTICULATES NOT OTHERWISE REGULATED, TOTAL
Tomas Aguilar UNI
OSHA: 15 mg/m³ NIOSH: no REL ACGIH: 10 mg/m³, total dust less than 1% quartz PROPERTIES: contains no asbestos and quartz less than 1% SYNONYMS: nuisance dusts; particulates not otherwise classified SAMPLING SAMPLER: FILTER (tared 37-mm, 5-µm PVC filter) FLOW RATE: 1 to 2 L/min
Field Methods for Determining Lead Content in Bridge Paint Removal Waste
2013 •
Lisa Axe
The removal of paint from bridges and other structures is a significant issue facing transportation agencies because of the presence and potential for release of lead and other contaminants upon disposal. A large percentage of the bridges are reaching a critical level of deterioration, resulting in management issues for paint waste. The New York State Department of Transportation (NYSDOT) applies a conservative approach by assuming all waste generated from bridges previously painted with lead-based paint (LBP) is hazardous. Therefore, an approach that provides accurate in-situ characterization of the waste classification would be beneficial. The goal of this project is to develop a rapid and cost-effective method that can provide an accurate characterization of waste classification. With 11 Regions and 2,385 bridges rehabilitated and subsequently repainted after NYSDOT stopped using LBP on bridges (after 1988), 24 bridges from across the NYS were selected for this study based on Sam...
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition ASBESTOS and OTHER FIBERS by PCM 7400
HERNAN DARIO PARDO VALENZUELA
Método para determinar presencia de ASBESTO
Beiträge zur Tabakforschung International/Contributions to Tobacco Research
Determination of Hydrogen Cyanide in Cigarette Smoke by Continuous Flow Analysis Method Using Safer Chemistry
2018 •
Tarur Dinesh
Summary A new safe and sensitive method to determine hydrogen cyanide (HCN) in cigarette smoke using continuous flow analyser (CFA) has been developed and validated. The use of highly toxic potassium cyanide (KCN) as a standard necessitates the development of a safer method for the determination of HCN in cigarette smoke. In this described method KCN is replaced by less toxic potassium tetracyanozincate (Lethal Dose LD50 oral is 7.49 mg/kg for KCN and 2000 mg/kg for potassium tetracyanozincate). Furthermore, the new method uses isonicotinic acid-barbituric acid (coupling reagent) instead of pyridine-pyrazolone as a reagent for the determination of HCN, and hence eliminates the use of pyridine. In this method HCN is trapped on both the Cambridge Filter Pad, then extracted with aqueous sodium hydroxide solution, and in an impinger containing the same solution. The solution thus extracted is oxidised to cyanogen chloride by Chloramine-T and treated with coupling reagent, the resulting ...
MDHS 101 SILICA
Aline Rodrigues
Scope 1 This method describes a procedure for the determination of time-weighted average concentrations of respirable crystalline silica (RCS) either as quartz or cristobalite in airborne dust. 2 The method is suitable only when using air sample filters of 25 mm diameter or less. Summary 3 A measured volume of air is drawn through a membrane filter mounted in a respirable dust sampler. The filter is then analysed directly by Fourier Transform infrared spectrometry (FTIR) or X-ray diffraction (XRD). The choice of analytical technique selected will depend largely on any potential interference present. 4 The method is suitable for the determination of quartz and cristobalite at a concentration of 20 μg to 1 mg on the 25 mm filter. Both FTIR and XRD responses are linear over this range. 5 The use of alternative methods not included in the MDHS series is acceptable provided they can demonstrate the accuracy and reliability appropriate to the application.
International Journal Of Medical Science And Clinical Invention
Respirable Silica: An Analysis of Recent Advances
2018 •
Paul Tchounwou
Prevention and reduction of anthropogenically released greenhouse gasses and respirable particulate matter has enhanced health with environmental monitoring. It has shown exposure to carcinogens. Air quality analysis showed silica, polycyclic aromatic hydrocarbons, sulfuroxides, nitroxides, and ozone were associated with respiratory diseases in urban, residential, street level areas near windows. Moreover, validation with measurements of temperature, humidity, climate change, or energy production and consumption may show more silica associated with public health.
Journal of Occupational and Environmental Hygiene
NIOSH field studies team assessment: Worker exposure to aerosolized metal oxide nanoparticles in a semiconductor fabrication facility
2016 •
Catherine Beaucham
Journal of occupational and environmental hygiene
A novel method for assessing respiratory deposition of welding fume nanoparticles
2014 •
Bean Chen
Welders are exposed to high concentrations of nanoparticles. Compared to larger particles, nanoparticles have been associated with more toxic effects at the cellular level, including the generation of more reactive oxygen species activity. Current methods for welding-fume aerosol exposures do not differentiate between the nano-fraction and the larger particles. The objectives of this work are to establish a method to estimate the respiratory deposition of the nano-fraction of selected metals in welding fumes and test this method in a laboratory setting. Manganese (Mn), Nickel (Ni), Chromium (Cr), and hexavalent chromium (Cr(VI)) are commonly found in welding fume aerosols and have been linked with severe adverse health outcomes. Inductively coupled plasma mass spectrometry (ICP-MS) and ion chromatography (IC) were evaluated as methods for analyzing the content of Mn, Ni, Cr, and Cr(VI) nanoparticles in welding fumes collected with nanoparticle respiratory deposition (NRD) samplers. ...
