山西省沁县泉水的中子活化研究

NEUTRON ACTIVATION STUDY OF SPRING WATER SAMPLES FROM QINXIAN COUNTY, SHANXI PROVINCE

  • 摘要: 本工作使用了冷冻浓缩、水样直接照射、仪器中子活化分析、除~(82)Br和分离~(56)Mn的简单放射化学流程,测定了山西省沁县7个泉水样品中的29种元素。结果表明,5个泉水中Sr含量在0.37—0.52mg/L,达到了饮用天然矿泉水的国家标准(Sr≥0.2mg/L)。它们的Na含量为11.5—18mg/L,属低Na型泉水,符合现代营养学要求和当前国际市场趋势。

     

    Abstract: water samples from seven springs in Qinxian County; Shanxi province, have been analyzed for 29 elements using both INAA and RNAA. Freeze concentraion (instead of freeze drying) and direct irradiation of concentrated water samples were used to overcome difficulties in quantitative transfer of dried residues, usually encountered in routine freeze drying procedure. Thermal neutron flux amplification caused by 4ml water samples(hydrogen induced thermalization of reactor fast neutrons) has been proven to be negligible. Two simple radiochemical procedures were established for the removal of ~(82)Br interference and the separation of ~(56)Mn. The final results indicate that the Sr concentrations in five out of the seven spring waters are in the range of 0.37—0.52mg/l, coming up to the National Standard for Natural Mineral Drinking Water (Sr>0.2mg,/L). The low Na and fairly abundant trace elements of nutritional interest in the five spring waters are in accordance with recent international market trends.

     

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