[en] Analytical methods are presented for determining about 135 chemicals in the atmosphere, in the workplace, and in biological materials. Specifically, methods were given for determining lead, mercury, antimony, arsenic, and fluoride in urine; lead and mercury in blood; nitrogen dioxide, carbon monoxide, cyanide, acrolein, beryllium, formaldehyde, organic solvents, hydrogen sulfide, arsenic, 2,4-toluenediisocyanate, sulfur dioxide, p,p'-diphenylmethanediisocyanate, vinyl chloride, cadmium, chromium, ozone, lead, parathion, oil mists, aromatic amines, chromic acid mist, fluoride, hydrogen fluoride, and mercury in air; free silica in atmospheric dust; and quartz in coal dust. For each analytical procedure described the principle of the method was presented followed by the range and sensitivity, possible interferences, precision and accuracy, advantages and disadvantages of the method, apparatus used, reagents, procedure, collection and shipping of samples, analysis of samples, calibration and standards, calculations, and citations to additional references of interest