Preliminary tests bromine test

Samples (156) were taken from 54 reference lithic pieces that represented five rock types. These samples were analyzed at the SLOWPOKE Reactor Facility of the University of Toronto. They were irradiated for 1 min at 2 kW, or for 1 or 2 min at 5 kW (depending on their radioactivity level in preliminary tests). Upon removal from the reactor, the samples, which weighed between 0.1 and 0.3 g, were left to decay for 18 min and were counted for 5 min with a Ge(Li) y-ray detector coupled to a multichannel analyzer. Trace element concentrations were calculated with the comparator method (7). The 15 elements examined were barium, titanium, sodium, aluminum, potassium, manganese, calcium, uranium, dysprosium, strontium, bromine, vanadium, chlorine, magnesium, and silicon. The first seven of these elements were the most useful in the differentiation of major rock types. 

Bromoform (tribromomethane [CAS 75-25-2]) Vapors highly irritating to eyes and respiratory tract. Well absorbed by inhalation and skin contact. CNS depressant. Liver and kidney injuiy may occur. Two preliminary tests Indicate that it may be an animal carcinogen. 0.5 ppm, S,A3 850 ppm Colorless to yellow liquid. Chloroform-like odor and Irritahon are adequate warning properhes. Vapor pressure is 5 mm Hg at 20°C (68°l. Not combustible. Thermal-breakdown products Include hydrogen bromide and bromine. 

Unsaturation. Consult the preliminary tests to ensure that the compoimd does not contain a centre of imsaturation. If necessary, repeat the bromine and potassium permanganate tests. Note that in a few instances bromine water and bromine in carbon tetrachloride are not decolourized at room temperature despite the olefinic character of the add, e.g. maleic add. 

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