X-ray Fluorescence Detection of Heavy Metals in Tea
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Solution Overview
Problem
Current methods for detecting heavy metals in tea are inefficient, requiring lengthy acid digestion processes that consume large amounts of acid, generate environmental pollution, and increase health risks for lab personnel, while also being costly and prone to errors.
Innovation Solution
A trace detection method using X-ray fluorescence spectrometry with a standard addition technique, where a quality sample is prepared and mixed with the tea sample in specific proportions, eliminating the need for acid digestion and allowing for accurate and rapid detection of heavy metals like As, Pb, Cd, Cr, Cu, Zn, and Ni.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acid digestion pretreatment is applied to detect heavy metals in tea, then the detection accuracy is improved, but the detection time is extended and environmental pollution increases
Solution Approach 1:
The patent extracts and removes the acid digestion pretreatment step from the detection process. By using X-ray fluorescence spectrometry directly on the tea sample without prior acid digestion, the method eliminates the time-consuming oxidation process while maintaining detection capability for heavy metals such as As, Pb, Cd, Cr, Cu, Zn, and Ni.
Solution Approach 2:
The patent replaces the chemical acid digestion process with a physical X-ray fluorescence measurement method. Instead of using chemical oxidants to convert organic substances to inorganic ions, the method uses X-ray irradiation to directly excite heavy metal atoms in the tea sample, enabling simultaneous detection of multiple elements without chemical treatment.
2Measurement precision
If acid digestion pretreatment is applied to detect heavy metals in tea, then the detection accuracy is improved, but the cost and health risks increase
Solution Approach 1:
The patent removes the harmful acid digestion step from the detection workflow. By eliminating the use of high-grade nitric acid and perchloric acid, the method eliminates associated health risks for laboratory personnel while maintaining the ability to accurately detect heavy metals through direct X-ray fluorescence measurement.
3Measurement precision
If acid digestion pretreatment is applied to detect heavy metals in tea, then the detection accuracy is improved, but the environmental pollution increases
Solution Approach 1:
The patent extracts and eliminates the acid digestion process that generates acid mists and chemical waste. By using direct X-ray fluorescence measurement, the method avoids producing harmful acid mists during digestion and eliminates the need for complex waste disposal procedures, thereby reducing environmental pollution.
4Reliability
If conventional detection methods are used for heavy metals in tea, then the detection capability is maintained, but the efficiency is reduced
Solution Approach 1:
The patent employs X-ray fluorescence spectrometry to simultaneously detect multiple heavy metal elements (As, Pb, Cd, Cr, Cu, Zn, Ni) in a single measurement process. This multi-element detection capability eliminates the need for separate detection procedures for each metal, significantly improving detection efficiency while maintaining comprehensive detection coverage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method significantly reduces detection time, minimizes acid usage, lowers costs, and enhances accuracy, providing a non-destructive, portable, and cost-effective means for simultaneous determination of multiple elements with reduced environmental impact.
Implementation Method 1
using X-ray fluorescence spectrometer to detect trace heavy metals
Data Source
AI summary
The invention belongs to the technical field of trace detection, and discloses a heavy metal trace detection method and application thereof. The detection method; comprising the following steps: preparing a quality sample; mixing the quality sample with the sample to be tested according to a specific proportion; using X-ray fluorescence spectrometer to detect trace heavy metals; and using standard curve to realize quantitative analysis of heavy metals. For the purpose of detecting heavy metal elements in tea, the application of this invention can shorten the detection time, avoid the use of a large amount of acid liquor, improve the environmental protection performance, and lower the detection cost, moreover, the obtained standard curve by this invention has high correlation and accurate detection results.