Outline

  • Abstract
  • Keywords
  • 1. Introduction
  • 2. Experimental
  • 2.1. Reagents and Materials
  • 2.2. Apparatus
  • 2.3. Preparation of Modified Organo Nanoclay
  • 2.4. Determination of Gold in Water Samples
  • 2.5. Analysis of Gold in Certified Reference Materials
  • 2.6. Preconcentration Procedure
  • 3. Results and Discussion
  • 3.1. Effect of the Sample Ph
  • 3.2. Evaluation of Sorbent Property
  • 3.3. Selection of Eluent
  • 3.4. Breakthrough Volume
  • 3.5. Interferences
  • 3.6. Analytical Performance
  • 3.7. Application of the Proposed Method
  • 3.8. Comparison of Modified Organo Nanoclay with Other Sorbents
  • 4. Conclusion
  • References

رئوس مطالب

  • چکیده
  • کلید واژه ها
  • 1. مقدمه
  • 2.بخش آزمایشگاهی
  • 2.1. مواد و واکنشگرها
  • 2.2. دستگاه ها
  • 2.3. آماده سازی نانو رس آلی اصلاح شده
  • 2.4. تعیین طلا در نمونه های آبی
  • 2.5. آنالیز طلا در مواد مرجع تایید شده
  • 2.6. روش پیش تغلیظ
  • 3. نتایج و بحث
  • 3.1. اثر pH نمونه
  • 3.2. ارزیابی ویژگی جاذب
  • 3.3. انتخاب شوینده
  • 3.4. حجم نفوذ
  • 3.5. تداخل ها
  • 3.6. عملکرد آنالیتیکی
  • 3.7. کاربرد روش ارائه شده
  • 3.8. مقایسه ی نانو رس آلی اصلاح شده با جاذب های دیگر
  • 4. نتیجه گیری

Abstract

In this work, the applicability of modified organo nanoclay as a new and easy prepared solid sorbent for the preconcentration of trace amounts of Au(III) ion from water samples is studied. The organo nanoclay was modified with 5-(4′-dimethylamino benzylidene)-rhodanine and used as a sorbent for separation of Au(III) ions. The sorption of gold ions was quantitative in the pH range of 2.0–6.0. Quantitative desorption occurred with 6.0 mL of 1.0 mol L−1 Na2S2O3. The amount of eluted Au(III) was measured using flame atomic absorption spectrometry. In the initial solution the linear dynamic range was in the range of 0.45 ng mL−1 to 10.0 μg mL−1, the detection limit was 0.1 ng mL−1 and the preconcentration factor was 105. Also, the relative standard deviation was ±2.3% (n = 8 and C = 2.0 μg mL−1) and the maximum capacity of the sorbent was 3.9 mg of Au(III) per gram of modified organo nanoclay. The influences of the experimental parameters including sample pH, eluent volume and eluent type, sample volume, and interference of some ions on the recoveries of the gold ion were investigated. The proposed method was applied for preconcentration and determination of gold in different samples.

Keywords: - - - -

Conclusions

This study demonstrates the suitability of modified organo nanoclay sorbents for the separation and preconcentration of trace amounts of Au(III). The proposed procedure for the modification of organo nanoclay is simple and, due to the possibility of multiple use of sorbent, is also economical, representing a potentially significant advantage in the preconcentration and analytical separation of gold ions. The method was applied for the determination of gold ions in water samples as well as standard samples and was found fast, precise, accurate and reliable with the preconcentration factor of as high as 105.

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