In this study, ascorbic acid (Vc) was employed as a matrix modifier to develop a direct analytical method for the determination of trace platinum in tailings using graphite furnace atomic absorption spectrometry (GFAAS). The paper explores the effectiveness of various matrix modifiers and highlights the advantages of using Vc. The method demonstrates a characteristic mass of 1.3×10â»â´ μg and a detection limit of 1.9×10â»Â³ μg/mL. The recovery rates for the samples ranged from 100.7% to 104.0%, confirming the accuracy and reliability of the approach.
The atomic absorption method has long been used for platinum analysis in different materials. However, due to the low concentration of platinum and the complex nature of the matrix, sample preparation is often time-consuming and complicated. Techniques such as foam adsorption or ion exchange fiber separation are commonly used, which can make the GFAAS process more cumbersome. In contrast, the use of matrix modifiers offers a simpler and more efficient way to reduce interferences and improve sensitivity. This paper presents a straightforward method using ascorbic acid as the matrix modifier, which significantly reduces interference from coexisting ions and enhances measurement accuracy.
The experimental setup included a Hitachi Zeeman 180-70 polarized atomic absorption spectrometer equipped with a GA-3 graphite furnace and an automatic sample introduction system. Platinum standard solutions were prepared by dissolving high-purity platinum in aqua regia and diluting to the desired concentration. Reagents were of analytical grade, and all glassware was made of quartz or PTFE to avoid contamination.
Instrument parameters were optimized for maximum sensitivity. The operating conditions included a slit width of 0.4 nm, a tube wall atomization mode, and a measurement method based on peak area. The graphite furnace settings were carefully adjusted to ensure accurate atomization and minimal loss of platinum during the process.
The influence of acidic media was investigated, and it was found that 0.1 mol/L nitric acid provided the best stability for platinum. A comparative study of various matrix modifiers showed that ascorbic acid was the most effective in reducing the atomization temperature and improving detection sensitivity. The mechanism behind this effect involves the formation of a reducing atmosphere, which helps in the complete reduction of platinum compounds to ground-state atoms, thus enhancing the signal intensity.
Experiments also revealed that pyrolytically coated graphite tubes offered better sensitivity compared to conventional ones, likely due to their reduced porosity and improved resistance to platinum permeation. The optimal amount of ascorbic acid was determined to be 4 µg per measurement, and the atomization time was set to 7 seconds to achieve the best precision.
The calibration curve was linear over a wide range of concentrations (2–500 µg/L), with a correlation coefficient of 0.9984. Sample analysis and spike recovery tests were conducted on tailings sand, and the results confirmed the method's reliability. The proposed technique offers a simple, accurate, and efficient way to determine trace platinum in complex matrices, making it a valuable tool for environmental and geochemical analysis.
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These versatile storage holders are available in various sizes and designs to cater to your specific needs. From spice racks and utensil holders to pot lid organizers and cutting board holders, we have a wide range of options to suit different kitchen essentials.
Our holders are intelligently designed to optimize space utilization. They feature multiple compartments, shelves, and hooks, allowing you to neatly store and access your kitchen items. Whether you have limited cabinet space or simply want to keep your kitchen essentials within reach, our storage holders are the perfect solution.
Durability is a key feature of our Kitchen Storage Holders. Made from sturdy materials such as stainless steel and high-quality plastic, they are built to withstand the demands of everyday use. You can trust our holders to keep your kitchen items secure and organized for years to come.
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