磷矿中碘元素的快速测试方法:以磷酸和高氯酸混合酸密闭加热分解磷矿,用盐酸羟胺使碘还原成低价态,加氨水调节溶液至碱性。取上清液5 m L,用稀氨水1∶1稀释后,用电感耦合等离子质谱仪测试磷矿中碘的含量。结果表明,加氨水浓度30%时,测...磷矿中碘元素的快速测试方法:以磷酸和高氯酸混合酸密闭加热分解磷矿,用盐酸羟胺使碘还原成低价态,加氨水调节溶液至碱性。取上清液5 m L,用稀氨水1∶1稀释后,用电感耦合等离子质谱仪测试磷矿中碘的含量。结果表明,加氨水浓度30%时,测试的结果最理想,取上清液用2%氨水稀释,可以解决不同磷矿的仪器测试带来的仪器堵塞和熄火的问题。两种磷矿国家一级标准物质GBW07210和GBW07211电感耦合等离子质谱仪测试结果均与推荐值吻合。测定误差均在允许范围内,方法的检出限为0.25μg/g,加标回收率为99.6%103.5%。精密度为2.32%3.21%,结果良好。实验结果表明该方法具有良好的稳定性和可靠性。展开更多
英坪磷矿位于瓮福矿田高坪矿区英坪矿段内,区内成矿地质条件优越,磷矿资源高度富集;矿石中普遍赋存伴生元素碘,产于下震旦统陡山沱组顶部第四段(Pt 33 d 4)磷块岩(b矿层)之中,产出层位稳定。通过英坪磷矿伴生元素碘的赋存特征分析,认识...英坪磷矿位于瓮福矿田高坪矿区英坪矿段内,区内成矿地质条件优越,磷矿资源高度富集;矿石中普遍赋存伴生元素碘,产于下震旦统陡山沱组顶部第四段(Pt 33 d 4)磷块岩(b矿层)之中,产出层位稳定。通过英坪磷矿伴生元素碘的赋存特征分析,认识碘在空间内沿走向、倾向、厚度方向上的变化规律及基本特性。通过碘的富集规律分析,初步认为:碘富集于非晶质、隐晶质的胶磷矿中,该矿物的形成与藻类生物活动密切相关;不同的沉积环境影响着磷块岩的形成类型以及藻类生物作用的强度,从而制约着磷块岩中碘的聚集、浓缩和富集。磷化工企业可以通过先进的工艺将磷矿石中伴生元素碘进行回收,不仅能创造丰厚的经济效益,还能避免碘对环境的污染。展开更多
In the present paper, iodine （I）, iron （Fe）, manganese （Mn）, cobalt （Co）, phosphorus （P） and calcium （Ca） contents in three ferromanganese crusts from the Pacific Ocean are measured by spectrophotometric m...In the present paper, iodine （I）, iron （Fe）, manganese （Mn）, cobalt （Co）, phosphorus （P） and calcium （Ca） contents in three ferromanganese crusts from the Pacific Ocean are measured by spectrophotometric method and inductively coupled plasma atomic emission spectrometers （ICP-AES） to investigate the contents and distribution of iodine in ferromanganese crusts. The results show that iodine contents in three crusts vary between 27.1 and 836 mg/kg, with an average of 172 mg/kg, and the profile of iodine in the three crusts all exhibits a two-stage distribution zone： a young non-phosphatized zone and an old phosphatized zone that is rich in I, P and Ca. The iodine content ratios of old to young zone in MP5D44, CXD62-1 and CXD08-1 are 2.3, 3.4 and 13.7, respectively. The boundary depths of two-stage zone in MP5D44, CXD62-1 and CXD08-1 locate at 4.0 cm, 2.5 cm and 3.75 cm, respectively, and the time of iodine mutation in three crusts ranges from 17-37 Ma derived from 129I dating and Co empirical formula, which is consistent with the times of Cenozoic phosphatization events. The present study shows that the intensity of phosphatization is the main responsible for the distribution pattern of iodine in the crusts on the basis of the correlation analysis. Consequently, iodine is a sensitive indicator for phosphatization.展开更多
文摘磷矿中碘元素的快速测试方法:以磷酸和高氯酸混合酸密闭加热分解磷矿,用盐酸羟胺使碘还原成低价态,加氨水调节溶液至碱性。取上清液5 m L,用稀氨水1∶1稀释后,用电感耦合等离子质谱仪测试磷矿中碘的含量。结果表明,加氨水浓度30%时,测试的结果最理想,取上清液用2%氨水稀释,可以解决不同磷矿的仪器测试带来的仪器堵塞和熄火的问题。两种磷矿国家一级标准物质GBW07210和GBW07211电感耦合等离子质谱仪测试结果均与推荐值吻合。测定误差均在允许范围内,方法的检出限为0.25μg/g,加标回收率为99.6%103.5%。精密度为2.32%3.21%,结果良好。实验结果表明该方法具有良好的稳定性和可靠性。
文摘英坪磷矿位于瓮福矿田高坪矿区英坪矿段内,区内成矿地质条件优越,磷矿资源高度富集;矿石中普遍赋存伴生元素碘,产于下震旦统陡山沱组顶部第四段(Pt 33 d 4)磷块岩(b矿层)之中,产出层位稳定。通过英坪磷矿伴生元素碘的赋存特征分析,认识碘在空间内沿走向、倾向、厚度方向上的变化规律及基本特性。通过碘的富集规律分析,初步认为:碘富集于非晶质、隐晶质的胶磷矿中,该矿物的形成与藻类生物活动密切相关;不同的沉积环境影响着磷块岩的形成类型以及藻类生物作用的强度,从而制约着磷块岩中碘的聚集、浓缩和富集。磷化工企业可以通过先进的工艺将磷矿石中伴生元素碘进行回收,不仅能创造丰厚的经济效益,还能避免碘对环境的污染。
文摘In the present paper, iodine （I）, iron （Fe）, manganese （Mn）, cobalt （Co）, phosphorus （P） and calcium （Ca） contents in three ferromanganese crusts from the Pacific Ocean are measured by spectrophotometric method and inductively coupled plasma atomic emission spectrometers （ICP-AES） to investigate the contents and distribution of iodine in ferromanganese crusts. The results show that iodine contents in three crusts vary between 27.1 and 836 mg/kg, with an average of 172 mg/kg, and the profile of iodine in the three crusts all exhibits a two-stage distribution zone： a young non-phosphatized zone and an old phosphatized zone that is rich in I, P and Ca. The iodine content ratios of old to young zone in MP5D44, CXD62-1 and CXD08-1 are 2.3, 3.4 and 13.7, respectively. The boundary depths of two-stage zone in MP5D44, CXD62-1 and CXD08-1 locate at 4.0 cm, 2.5 cm and 3.75 cm, respectively, and the time of iodine mutation in three crusts ranges from 17-37 Ma derived from 129I dating and Co empirical formula, which is consistent with the times of Cenozoic phosphatization events. The present study shows that the intensity of phosphatization is the main responsible for the distribution pattern of iodine in the crusts on the basis of the correlation analysis. Consequently, iodine is a sensitive indicator for phosphatization.
