A Quantitative Analysis Method of 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 are weighed into a reagent bottle, a standard solution of the element to be tested is added to the reagent bottle, and deionized water is used as a solvent to dilute to obtain a solution of corresponding concentration, which is ready for use. The standard solution containing surfactant and / or high boiling point solvent can effectively improve the uneven distribution of the element to be tested during the drying process of the droplet. The surfactant is not particularly limited, any substance that can be dissolved in water and can significantly reduce the surface energy of water can be selected, for example, it can be selected from 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...
Embodiment 1
[0043] Weigh 0g, 0.05g, 0.10g and 0.15g of surfactant F-127 into reagent bottles respectively, 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. When the surfactant F-127 is added in an amount of 2-3wt% and dried under an infrared lamp (80-105°C), the distribution of elements in the dry droplets obtained is relatively uniform (see figure 1 ).
[0044] A series of standard solutions of neodymium element with different concentrations were prepared, such as 0 μg / mL, 2.5 μg / mL, 5 μg / mL, 10 μg / mL, and the addition amount of surfactant F-127 in the standard solution was controlled to be 2wt%. Use a pipette to accurately pipette 0.3 μL of each of the series of standard solutions onto the surface of the NIST612 sample, and place it under an infrared lamp for drying. The drying temperature is controlled at 80-105°C. After drying, the dry droplets have a ra...
Embodiment 2
[0046] Weigh 0.2 g of formamide solution into a reagent bottle, add 0.002 g of methylene blue, and use 20 μg / mL neodymium element standard solution to weigh to 5 g. Pipette 0.3 μL of the prepared solution to the surface of the sample to be tested with a 0-2.5 μL pipette, and place it under an infrared lamp (25-45 ° C) to dry. 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 element with different concentrations, such as 0μg / mL, 2.5μg / mL, 5μg / mL, 10μg / mL, and control the addition amount of formamide in the standard solution to be 4wt%, and the addition amount of methylene blue to be 0.04wt% %. Use a 0.1-2.5 μL pipette to accurately pipette 0.3 μL of each of the series of standard solutions onto the surface of the NIST612 sample, and place it under an infrared lamp for drying. The drying temperature is controlled at 25-45 °C. After drying, the dry dropl...
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