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In this paper a porccdute of pyrohydrolysis-spectrophotometric determination has been es-tablished for chlorine in rocks and minerals.The selection of accelerator and its requiredquantity,the time and temperature of sample decomposition and the influence of interferringelements and other factors are also discussed in detail.Because samples are usually fusedwith alkalis,higher blank is an insurmountable problem.However,with our procedure,theabove-mentioned drawback can be effectively overcome,and the determination of trace chlori-ne either in Igrge or in minor quantities of samples also is rather ideal.The determined re-suits indicate that the relative standard deviations are 8.7％ in the former and 4.5％ in thelatter case.This procedure is simple,rapid and well reproduceable.The detection limit ofthe method is 10ppm.The results obtained by our procedure are in good agreement with theproposed values from two reference samples in China(DZ ∑-1 and DZ∑-2)and one interna-tional geochemical reference Sample(RGM-1).This method has proved itself to be reliable.
In this paper a porccdute of pyrohydrolysis-spectrophotometric determination has been es-tablished for chlorine in rocks and minerals.The selection of an accelerator and its requiredquantity, the time and temperature of sample decomposition and the influence of interfering elements and other factors are also discussed in detail .Because samples are usually fusedwith alkalis, higher blank is an insurmountable problem. Yetever, with our procedure, theabove-mentioned drawback can be valid overcome, and the determination of trace chlori-ne either in Igrge or in minor quantities of samples also is rather ideal.The determined re-suits indicate that the relative standard deviations are 8.7% in the former and 4.5% in thelatter case.This procedure is simple, rapid and well reproduceable. The detection limit of the method is 10ppm.The results obtained by our procedure are in good agreement with theproposed values from two reference samples in China (DZΣ-1 and DZΣ-2) and one interna-tional geoche mical reference Sample (RGM-1). This method has proved itself to be reliable.