Determination of hydrogen in zirconium-niobium alloy by inert gas fusion-infrared absorption method
The hydrogen content in zirconium-niobium alloy will influence on the mechanical property of ma-terial.Therefore,it should be accurately determined and strictly controlled.The zirconium-niobium alloy sample was cut into strip specimens(3 mm×3 mm×20 mm)by wire cutting method.Then the specimens were polished until the surface was smooth.After cutting into small particles with mass of about 0.1 g,the specimens were cleaned with acetone.0.10 g of specimen was weighed and transferred into duplex graphite crucible after degassing.The analysis power was controlled at 4.0 kW,and the integral time was 50 s.The determination of low content hydrogen(less than 5 μg/g)in zirconium-niobium alloy by inert gas fusion-infrared absorption method was realized.The limit of detection was 0.03 μg/g,and the limit of quantification was 0.1 μg/g.The hydrogen content in two zirconium-niobium alloy samples was deter-mined according to the experimental method,and the found result was 4.3 and 2.2 μg/g,respectively.The relative standard deviation(RSD,n=11)was 8.6％and 20％,respectively.The hydrogen content in zirconium-niobium alloy samples(with hydrogen content of 4.3 µg/g)was measured by thermal conductiv-ity method for comparison,and the determination results were consistent with those by the infrared meth-od.
inert gas fusioninfrared absorption methodzirconium-niobium alloylow hydrogen
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