Bubblers, midget

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... 

Midget bubblers were used as a last resort where sorbent methods had failed. Bubblers were generally charged with a derivatiz-ing agent that would stabilize the analyte. Aldehydes were collected as Girard "T" or hydroxylamine derivatives that could be analyzed by polarography or HPLC with uv detection. 

Samples were collected in midget bubblers containing dilute sodium carbonate solutions. Analysis of formate ion in these solutions was performed using a 500 mm anion separator column and sodium borate eluent. Analysis of formate in these solutions was also performed using the ion chromatography exclusion mode (ICE) using the Dionex IE-C-1 column with dilute hydrochloric acid eluent. 

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. 

Draw air through filter and a midget bubbler in series. DNOC extracted into ethylene glycol and 2-propanol added before analysis... 

Air Drawing of air through a midget bubbler containing 15 DC polarography 0.3 mg/m 100 NIOSH... 

Samples collected should be full shift (at least 7-hour) samples. Sampling should be done using a personal sampling pump at a flow rate of 2 liters per minute. Samples should be collected on 0.8 micrometer pore size membrane filter (37 mm diameter). Volatile arsenicals such as arsenic trichloride can be most easily collected in a midget bubbler filled with 15 ml. of 0.1 N NaOH. 

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