Rekha D, Suvardhan K, Kumar J Dilip, Subramanyam P, Prasad P Reddy, Lingappa Y, Chiranjeevi P
Environmental Monitoring Laboratory, Department of Chemistry, S.V. University, Tirupati-517502, AP, India.
J Hazard Mater. 2007 Jul 19;146(1-2):131-6. doi: 10.1016/j.jhazmat.2006.11.059. Epub 2006 Dec 6.
A novel column solid phase extraction procedure was developed for the determination of lead, nickel, copper and manganese in various water samples by flame atomic absorption spectrometry (FAAS) after preconcentration on sodium bispiperdine-1,1'-carbotetrathioate (Na-BPCTT) supported by Amberlite XAD-7. The sorbed element was subsequently eluted with 1M nitric acid and the acid eluates are analysed by Flame atomic absorption spectrometry (FAAS). Various parameters such as pH, amount of adsorbent, eluent type and volume, flow-rate of the sample solution, volume of the sample solution and matrix interference effect on the retention of the metal ions have been studied. The optimum pH for the sorption of above mentioned metal ions was about 6.0+/-0.2. The loading capacity of adsorbent for Pb, Cu, Ni and Mn were found to 28, 26, 22 and 20x10(-6) g/mL, respectively. The recoveries of lead, copper, nickel and manganese under optimum conditions were found to be 96.7-99.2 at the 95% confident level. The limit of detection was 3.0, 3.2, 2.8 and 3.6x10(-6) g/mL for lead, copper, nickel and manganese, respectively by applying a preconcentration factor 50. The proposed enrichment method was applied for metal ions in various water samples. The results were obtained are good agreement with reported method.
开发了一种新型柱固相萃取方法，用于通过火焰原子吸收光谱法（FAAS）测定各种水样中的铅、镍、铜和锰。该方法是在由Amberlite XAD - 7负载的双哌啶 - 1,1'-碳四硫代酸酯钠（Na - BPCTT）上进行预富集后，再用1M硝酸洗脱吸附的元素，然后对酸洗脱液进行火焰原子吸收光谱分析（FAAS）。研究了各种参数，如pH值、吸附剂用量、洗脱剂类型和体积、样品溶液流速、样品溶液体积以及基质对金属离子保留的干扰效应。上述金属离子吸附的最佳pH约为6.0±0.2。发现吸附剂对铅、铜、镍和锰的负载量分别为28、26、22和20×10⁻⁶ g/mL。在最佳条件下，铅、铜、镍和锰的回收率在95%置信水平下为96.7 - 99.2。通过应用50的预富集因子，铅、铜、镍和锰的检测限分别为3.0、3.2、2.8和3.6×10⁻⁶ g/mL。所提出的富集方法应用于各种水样中的金属离子。获得的结果与报道的方法吻合良好。
