泗滨砭石冲泡水的微量元素成分特征

Characteristics of trace element composition of Sibin Bian-stone infused water

泗滨砭石是一种产于山东古泗水流域的结构致密、含CaCO3高达96%的微晶灰岩,本文分别用超纯开水和加入多元素等离子体标准溶液的开水,对泗滨砭石碎块进行冲泡实验,在不同时段用ICP-AES和ICP-MS分别测定冲泡液中微量元素的含量,以了解饮用砭石泡水的水质状况。实验取得了如下结果：（1）超纯开水的冲泡液不含对人体有害的Cd、Cr、Cu、Pb和Zn等重金属元素,但含有很微量的Ca、Mg、Sr、Na、K和Si等常见元素,其含量随着冲泡时间的延长呈现上升的趋势,但都大大低于国家对生活用水质量标准的指标,且冲泡液的pH值稳定在8.1~8.2之间,呈弱碱性,口感较好。（2）在加入标准溶液的冲泡液中,主要常见元素的含量,均随着冲泡时间的延长和pH值的上升呈连续增高趋势,但稀土元素和对人体有害重金属元素,以及绝大多数金属离子的含量都呈连续下降的趋势。（3）CaCO3的溶解、金属离子碳酸盐沉淀和金属离子与CaCO3表面之间的吸附,是导致冲泡液中绝大多数金属离子浓度呈连续下降趋势的三个主要因素。（4）砭石冲泡的水虽无毒无害,口感较好,并具有降低冲泡用水中有害重金属元素浓度和对人体适当补充Ca和K的功能,但由于各种离子的浓度都比较低,饮用砭石冲泡水与饮用一般的弱碱性瓶装水的差别并不很大。

The Sibin Bian-stone is a structurally compact micromeritic limestone with 96% of CaCO3. In order to comprehend the quality of Sibin Bian-stone infused water for drinking, we measured trace elements in two type infused waters, one is in pure boiled water and the other is in boiled water with added multi-element standard solution using ICP-AES and ICP-MS techniques, respectively. The results of our study are as follows： （1） The pure boiled infused water does not contain heavy metallic elements that are harmful to human health, such as Cd, Cr, Cu, Pb, Zn, but contains main common elements like Ca, Mg, St, Na, K and Si, and their contents increase with increasing of infusing time, but all of them are much lower than the quality indexes of national standards for tap water of China, and the pH value of the infused water stabilizes in the range of 8.1-8.2, appearing weak alkalinity, suitable to people＇s taste. （2） In the infused boiled water added by standard solution, the contents of the main common elements increase with increasing infusing time and pH values, but REE, harmful heavy metallic elements, and most metallic micro-elements decrease continuously with increasing infusing time and pH values. （3） Dissolution of CaCO3, precipitation of metallic ion carbonates, and adsorption between metallic irons and CaCO3 surface are three main factors that caused the continuous decreasing of concentrations of most metallic ions in the infused water. （4） Although the Sibin Bian-stone infused water is harmless, nontoxic, and capable to reduce the content of harmful heavy metallic elements in the water, as useful elements Ca and K to human health, drinking of Bian-stone infused water comparison with drinking of weak alkaline bottled water. suitable to people＇s taste, well as to supply some of is of little differences incomparison with drinking of weak alkaline bottled water.