The Applanation Tonometer

Determination of Particulate Lead Content in Air

“…&.2dp. The estimated geometric standard deviation of the constant was 1.02-that is, approximately, the value is expected to be accurate within ±2%-where dh and dp are reaction site and particle diameter, respectively. The insoluble particles (Figure 2) treated with hydrofluoric acid only, obeyed a higher order law: dh -0.98 dpI'30.…”

“…This study combines two previous techniques used for atmospheric sampling and testing. The method for the identification of lead of Amdur and Silverman (1) involves the use of an alcoholic solution of tetrahydroxyquinone, which gives a deeply colored red precipitate with lead. In their method, the sample is collected on filter paper and buffered reagent is applied to the area.…”