In the Belle, W. Va. accident, the sample taken for chemical analysis was removed from the surface of the plate rather than from the quarterthickness position. The phosphorus content was determined by photometric analysis (ASTM E3S0) and the sulfur by combustion-ti tration analysis (ASTM E395). (ii) In the Callao, Mo. accident, optical emission spectroscopy was used to determine all of the elements, including carbon.
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