Rapid Thermo-conductometric Determination of Nitrogen in Petroleum Coke

The Leco CHN-2000 elemental analyzer (by thermoconductometry) was used for determination of nitrogen in petroleum coke.Working condition of the instrument,preparation of the petroleum coke sample,especially the size of sample and the condition for combustion of sample were studied thoroughly and described in detail.Precision of the instrument was tested by analyzing a petroleum coke sample for its nitrogen contents with 8 determinations,giving value of RSD of 0.40%.One determination of a sample was completed within 5 min.High-purity EDTA (acid form) was used as primary standard in preparation of calibration curve.Petroleum coke samples were analyzed both by this method and by the kjeldahl method,results obtained were tested by the t-test showing that there is no significant difference between the two methods.