An ion chromatographic method for separation and determination of the sum of the rare earth elements in addition to the individual determination of some heavy metal ions has been developed. The separation has been performed on a mixed bed column, IonPac CS5A containing both anion and cation exchange sites. Selective separation of heavy metals was performed by isocratic elution using pyridine-(2,6)-dicarboxylic acid eluent followed by on-line elution of the total rare earth elements using oxalic acid eluent. Post-column spectrophotometric detection with 4-(2-pyridylazo) resorcinol was then coupled at 530 nm. The separation factors of the different ions were found to be dependent on the eluent concentration, the pH and to a much more extent on the flow rate. The optimized developed method has been validated by its application for the analysis of some heavy metals and the sum of the rare earth elements in a sample from Abu Rusheid mineralization that is considered as a reference material and has then been used for the analysis of two other samples represent two different localities one of which is from Gabal Gattar area while the other is from Abu Tartour phosphate deposits. The optimized method enabled the successful determination of both heavy metals and rare earth elements sum within a total analysis time of about 20 min with high reproducibility.

中文翻译：

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某些地质材料中某些重金属和稀土元素的色谱分离测定

除个别重金属离子的测定方法外，还开发了一种离子色谱法，用于分离和测定稀土元素的总量。分离是在包含阴离子和阳离子交换位点的混合床色谱柱IonPac CS5A上进行的。重金属的选择性分离是通过使用吡啶-（2,6）-二羧酸洗脱液进行等度洗脱，然后使用草酸洗脱液在线洗脱全部稀土元素。然后在530 nm处耦合用4-（2-吡啶基偶氮）间苯二酚进行柱后分光光度检测。发现不同离子的分离系数取决于洗脱液浓度，pH值，并且在很大程度上取决于流速。优化的开发方法已通过其用于分析一些重金属和阿布·鲁西德矿化样品中稀土元素总和的验证，该样品被视为参考材料，然后用于分析另外两种样品代表两个不同的地区，其中一个来自加巴尔加塔尔地区，另一个来自阿布塔图尔磷酸盐矿床。优化的方法能够在大约20分钟的总分析时间内成功测定重金属和稀土元素的总量，并且具有很高的重现性。