摘要
为提高畜禽饮用水中痕量铬的测定灵敏度及降低检出限,采用螯合剂1-（2-吡啶偶氮）-2-萘酚-6-磺酸（PAN-S）处理聚丙烯基强碱性阴离子交换纤维,制得PAN-S负载纤维;用PAN-S负载纤维富集畜禽饮用水中痕量铬,然后用电感耦合等离子体质谱（ICP-MS）法测定,建立PAN-S负载纤维富集—ICPMS法测定畜禽饮用水中痕量铬的方法。结果表明：当待富集液体积小于1 000 mL、pH 6、上柱流速小于15mL/min时,铬可被有效富集,且富集不受K^＋、Na^＋、Ca^2＋、Mg^2＋等共存离子的干扰;用0.2mol/L硝酸10mL能完全洗脱,洗脱液能满足ICP-MS法测定的要求;该方法的回收率为90.0%～96.0%,相对标准偏差（RSD）在1.0%～2.2%,检出限为0.02μg/L;应用优化的富集测定方法和常规的二苯碳酰二肼分光光度法同时对30份畜禽饮用水样品进行痕量铬的检测,两种方法的测定结果基本一致,说明优化的富集测定方法可应用于畜禽饮用水中痕量铬的检测。
The Cr content in drinking water of livestock and poultry was detected by ICP-MS based on PAN-S loaded fiber [polypropylene strongly basic anion-exchange fiber treated by1-（2-pyridylazo）-2-naphthol-6-sulfonic acid（PAN-S）chelating agent]to increase Cr sensitivity and decrease Cr detection limit in drinking water of livestock and poultry.When the volume of enrichment solution with pH 6is less than1 000 ml and the flow velocity of the upper column is less than 15mL/min,Cr can be enriched effectively and Cr enrichment is not disturbed by co-existing ions of K^＋,Na^＋,Ca^2＋and Mg2.10 mL eluant of nitric acid with 0.2mol/L can meet the measuring demand of ICP-MS method.The recovery,RSD and detection limit of the PAN-S loaded fiber with ICP-MS are 90.0% ～96.0%,1.0% ～2.2% and 0.02μg/L respectively.The measuring results of 30 drinking water samples detected by PAN-S loaded fiber with ICP-MS and conventional spectrophotometry is the same basically,which indicates that PAN-S loaded fiber with ICP-MS can be used in Cr detection of drinking water for livestock and poultry.
出处
《贵州农业科学》
CAS
北大核心
2014年第11期187-191,共5页
Guizhou Agricultural Sciences
基金
广西区直属公益性科研院所基本科研项目"功能纤维分离富集海水中重金属镉的研究"[GXIF-2014-19]
