Midget impinger

Ammonia Midget impinger 25 ml 0.1 N sulfuric 1-3 10 Nessler reagent —... 

Hydrogen sulfide Midget impinger 15 ml 5% cadmium 1-2 20 -t-95 Add 0.05 N iodine. Mercaptans, carbon... 

Fritted midget impinger Midget impinger, fritted rubber... 

Toluene diisocyanate Midget impinger 15 ml Marcali solution 1 25 95 Diazotlzation and coupling reaction Materials containing reactive hydrogen attached to oxygen (phenol) certain other diamines... 

Vinyl acetate Fritted midget impinger and simple midget impinger in series Toluene 1.5 15 + 99 (84 with fritted bubbler only) Gas chromatography (Hher substances with same retention time on column... 

Impinger Midget impinger By bubbling through liquid phase ... 

Breath Collect air from breathing zone using a midget impinger containing calcium hydroxide-calcium sulfide-arabinogalactan slurry add solution of A/iV-dimethyl-p-phenylenedi-amine and ferric chloride. Spectrophotometry 0.20 pg/m3 80 NIOSH 1977... 

For occupational measurements of airborne concentrations, NIOSH (1977a) recommended the use of a midget impinger for sampling breathing zone air and the methylene blue/spectrophotometric method for the analysis of hydrogen sulfide. The detection limit was 0.20 g/m3 (0.14 ppb). 

Trap H2S in an aqueous NaOH and ascorbic acid in a midget impinger titrate resulting sulfide ion with CdS04 solution. Potentiometry ppb levels NR Ehman 1976... 

Occupational air (NIOSH Method 7904) Filtered air collected in midget impinger containing NaOH extraction of filter with NaOH sulfide removed. Specific ion electrode (HCN cyanide salts) 2.5 pg CNa 96.7 at 5-21 mg/m3 NIOSH 1989a... 

Occupational air Passage of filtered air through midget impinger containing NaOH conversion of NaCN to sodium formate. Optional ion exchange clean-up. Ion-chromatography/ amperometric detector (HCN) 5-10 ppm 100-109 at 5-20 ppm Dolzine et al. 1982... 

Air Filtered air collected in midget impinger Ion-chromatography/ amperometric detection (HCN only) 0.04 ppm (for 2.6 L of air) 91 at air flow rate of 0.171 L/minute Cassinelli 1986... 

C.I. Direct Brown 95 at this new LAQL. Because of the problems encountered with the midget impinger humidification system, changes were made to incorporate one large impinger and supply the humidified air to the filter cassettes at atmospheric and not reduced pressure. Again, 60 L of humidified air were pulled through each cassette. The results of this study are shown in Table V. Recoveries of C.I. Direct Black 38 and C.I. Direct Brown 95 were approximately 90%. 

A suitable trap for aerosol collection is the U.S.-made portable Midget Impinger (Model PMI-A), made of polyethylene, as supplied in the U.K. by MDA Scientific (UK) Ltd. (Wimborne,... 

Current methods of collecting personal samples of organotin compounds produce erratic, inconsistent results. Use of the most efficient collection scheme, concentrated HNO3 in a midget impinger, is certainly unsafe. 

The stationary sampling train consisted of a sample cassette containing the filters as described, a midget impinger containing 10 mL of concentrated HNO3 to trap any breakthrough or volatile... 

SPinto J.R. Fahy, JIndHygToxicol 24, 24-6(1942) CA 37,847(1943)(I etn TNT in air by collecting the sample in isopropanol by means of a midget impinger, reducing the TNT to triaminotoluene with TiCl, and estimating the triamino compd colorimetric ally after diazotization and coupling as described in the paper) 10)F. 

Air is drawn through a midget impinger or a bubbler containing 0.1 ANaOH solution. Phenol and ciesols are trapped as phenolates. The pH of the solution is adjusted <4 by H2S04. The compounds are determined by reverse-phase HPLC with UV detection at 274 nm. An electrochemical or fluorescence detector may also be used. The solution may be analyzed by colorimetric or GC-FID technique. 

Air drawn through a midget impinger containing 0.05% DNPH reagent in dilute HC1 and isooctane (immisicible) derivative formed partitions into iso-octane 1997 by CRC Press LLC... 

Air drawn through a midget impinger containing 10 mL of 2 N I ICl/0.5% DNPH and 10 mL isooctane the stable DNPH derivative formed partitions into isooctane layer, isooctane layer separated aqueous layer further extracted with 10 mL 70/30 hexane/methylene chloride the latter combined with isooctane the combined organic layer evaporated under a steam of N2 residue dissolved in methanol the DNPH derivative determined by reversed phase HPLC using UV detector at 370 nm (U.S. EPA Method TO-5, 1988). 

Air drawn through a midget impinger containing 10 mL of 2% aniline in toluene (by volume) phosgene reacts with aniline forming carbanilide (1,3-dipheny-lurea) solvent evaporated at 60°C under N2 flow residue dissolved in 1 mL acetonitrile carbanilide analyzed by reverse-phase HPLC with an UV detector set at 254 nm (EPA Method T06) recommended flow rate 200 mL/min sample volume 20 L. 

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