Method for measuring concentration of octafluoronaphthalene solution in isooctane

A technology of solution concentration and determination method, applied in the field of stoichiometry, can solve the problems affecting the development, use and application range, and achieve the effect of good measurement linearity and repeatability, wide application range and accurate value

Inactive Publication Date: 2019-09-13

SHANDONG MEASUREMENT SCI RES INST

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Problems solved by technology

[0003] Therefore, accurate determination of the concentration of octafluoronaphthalene solution in low-concentration isooctane is the premise. At present, only gas chromatography electron capture detector (ECD) is u...

Abstract

The invention discloses a method for measuring the concentration of an octafluoronaphthalene solution in isooctane. A fluorescence detector is used for obtaining the detection excitation wavelength and the detection emission wavelength of the octafluoronaphthalene; and a liquid chromatography fluorescence detection method is used for measuring the concentration of the octafluoronaphthalene solution in the isooctane in a range of 10-150 pg/[mu]L. The accuracy of the value of the octafluoronaphthalene solution in the low-concentration isooctane is verified from a new angle; the accuracy of a measurement result is improved; and the measurement and application ranges of the octafluoronaphthalene solution in the isooctane are expanded.

Application Domain

Component separation

Technology Topic

PhysicsLiquid Chromatography-Fluorescence +3

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Examples

Experimental program(1)
Effect test(1)

Example Embodiment

[0050] Example 1

[0051] The method for measuring the concentration of octafluoronaphthalene solution in isooctane provided by the present embodiment 1 comprises the following steps:

[0052] Step S110: Set up a liquid chromatography fluorescence detector according to the following conditions: chromatographic column: C18 chromatographic column, length 250 mm, inner diameter 4.6 mm, particle size 5 μm; mobile phase: 76.5% methanol+13.5% water; flow rate: 1.0 mL/min; Column temperature: 40 °C; injection volume: 20 μL.

[0053] Step S120: Determine the detection excitation wavelength and detection emission wavelength of the liquid chromatography fluorescence detector, specifically, the following steps are performed:

[0054] Step S121 : use a liquid chromatography fluorescence detector to measure the fluorescence response intensity of octafluoronaphthalene in the wavelength range of 200-400nm with a rough scan step size of 30nm, and the excitation wavelength 214nm and the emission wavelength 350nm corresponding to the maximum fluorescence response intensity are respectively Primary excitation wavelength and primary emission wavelength.

[0055] Step S122: Fix the excitation wavelength as the primary excitation wavelength of 214 nm, take 5 nm as the scanning step, measure the fluorescence response intensity of octafluoronaphthalene under different emission wavelengths, and select the emission wavelength range 355-365 nm where the maximum fluorescence response intensity is located as the preferred emission wavelength range. like figure 1 shown.

[0056] Step S123: Fix the emission wavelength as the primary emission wavelength of 350 nm, take 5 nm as the scanning step, measure the fluorescence response intensity of octafluoronaphthalene under different excitation wavelengths, and select the excitation wavelength range 209-219 nm where the maximum fluorescence response intensity is located as the preferred excitation. wavelength range. like figure 2 shown.

[0057] Step S124: In the preferred emission wavelength range of 355-365 nm, 355 nm is selected as the detection excitation wavelength, and in the preferred excitation wavelength range of 209-219 nm, 214 nm is selected as the detection emission wavelength. It should be noted that, in this step, any emission wavelength in the preferred emission wavelength range can also be selected as the detection emission wavelength, including 355nm and 365nm, and the selection of the detection excitation wavelength is also the same.

[0058] Step S130: fix the excitation wavelength to the detection excitation wavelength of 214 nm, and fix the emission wavelength to the detection emission wavelength of 355 nm, measure the octafluoronaphthalene solution in the isooctane to be tested, obtain the chromatographic peak area to be tested, and measure the isooctane of known concentration. The octafluoronaphthalene solution is obtained to obtain the known chromatographic peak area, and the concentration of the octafluoronaphthalene solution in the isooctane to be measured is calculated according to the chromatographic peak area to be measured, the known concentration and the known chromatographic peak area.

PUM

Property	Measurement	Unit
The inside diameter of	4.6 ~ 250.0	mm
Particle size	5.0	µm

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Method for measuring concentration of octafluoronaphthalene solution in isooctane

A technology of solution concentration and determination method, applied in the field of stoichiometry, can solve the problems affecting the development, use and application range, and achieve the effect of good measurement linearity and repeatability, wide application range and accurate value

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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