Quantitative analysis method for laser ablation inductively coupled plasma mass spectrometry
An inductively coupled, laser ablation technique used in analytical chemistry
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[0032] Preparation of standard solutions. In some embodiments, the surfactant and / or high boiling point solvent is weighed into the reagent bottle, the standard solution of the element to be measured is added to the reagent bottle, and the solution is diluted with deionized water as a solvent to obtain a solution of corresponding concentration, ready for use. The inclusion of surfactants and / or high boiling point solvents in the standard solution can effectively improve the uneven distribution of the analyte elements during the droplet drying process. Surfactants are not particularly limited, any material that can significantly reduce the surface energy of water when dissolved in water can be selected from, for example, F-127 (polyoxyethylene polyoxypropylene ether block copolymer), P-123 (polycyclic One of ethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer) and SDS (sodium dodecyl sulfonate). The high-boiling-point solvent refers to a solvent having a b...
Embodiment 1
[0043] Weigh 0g, 0.05g, 0.10g, and 0.15g of surfactant F-127 into reagent bottles, and use 20μg / mL neodymium element standard solution to weigh to 5g. Pipette 0.3 μL of the prepared solution to the surface of the sample to be tested through a 0.1-2.5 μL pipette gun. When the add-on of surfactant F-127 is 2-3wt%, and place the distribution of elements in the dry droplet obtained when drying under infrared lamp (80-105 ℃) comparatively uniform (see figure 1 ).
[0044] Prepare a series of standard solutions of neodymium element with different concentrations, such as 0 μg / mL, 2.5 μg / mL, 5 μg / mL, 10 μg / mL, and control the addition of surfactant F-127 in the standard solution to 2wt%. Use a pipette gun to accurately pipette 0.3 μL of each of the series of standard solutions to the surface of the NIST612 sample, and place it under an infrared lamp for drying, and the drying temperature is controlled at 80-105°C. After drying, the radius of the dry droplets is 1400-1900 μm. Use mu...
Embodiment 2
[0046] Weigh 0.2 g of formamide solution into a reagent bottle, add 0.002 g of methylene blue, and weigh to 5 g using 20 μg / mL neodymium element standard solution. Pipette 0.3 μL of the prepared solution to the surface of the sample to be tested through a pipette gun with a specification of 0-2.5 μL, and dry it under an infrared lamp (25-45°C). The distribution of elements in the dry droplets obtained by this scheme is relatively uniform (see figure 2 ).
[0047] Prepare a series of standard solutions of neodymium with different concentrations, such as 0μg / mL, 2.5μg / mL, 5μg / mL, 10μg / mL, and control the addition of formamide in the standard solution to 4wt%, and the addition of methylene blue to 0.04wt %. Use a pipette gun with a specification of 0.1-2.5 μL to accurately pipette 0.3 μL of each standard solution of this series to the surface of the NIST612 sample, and place it under an infrared lamp for drying at a temperature of 25-45 °C. After drying, the radius of the dry...
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