This International Standard specifies an infra-red absorption method after combustion for the determination of the sulfur content of nickel and ferronickel in the range 0,001 to 0,3 % (m/m), and of nickel alloys in the range 0,001 to 0,1 % (m/m). Examples of compositions are given in annex A. NOTE — It may be possible to apply this method in the range 0,000 2 to 0,001 % (m/m). However, there were insufficient laboratory test data to support the inclusion of this lower level in the scope.