Inductively Coupled Spectrometer for Automotive Urea Catalyst Inductively Coupled Spectrometer for Automotive Urea Catalyst

accord withGB29518-2013 Appendix G（Diesel engine nitrogen oxide reducing agent urea aqueous solution）Technical requirements;Can detectAutomotive urea aqueous solution/In automotive catalysts：calciumIron copper zinc chromium nickel aluminum magnesium potassium sodiumWaiting for the content of over 60 elementsSee the element detection limit table for details:

The overall introduction of the instrument is as follows:

ICPThe operation of the spectrometerPrinciple:When high-frequency current passes through an inductive coil, an alternating magnetic field is generated in the surrounding airHThis alternating magnetic field ionizes space, but it is still non-conductive. Although there is an alternating magnetic field inside the torch tube, plasma cannot be formed. If a few sparks are ignited at the nozzle using a leak detector or other methods, a small amount of argon gas will ionize, producing electrons and ions“seed”At this point, the alternating magnetic field immediately induces these“seed”Accelerate it in the opposite direction and flow along a closed loop inside the torch tube, forming a vortex. At this point, electrons and ions are accelerated by a high-frequency field and generate heat due to the obstruction of airflow during motion, reaching high temperatures while undergoing ionization, resulting in more electrons and ions and the formation of a plasma torch; Due to the high-frequency current passing through the carrier, it has a skin effect（skin effect)The current mainly flows within the thin layer on the surface of the conductor. The higher the frequency, the better the conductivity of the plasma, and the heating of the plasma is concentrated in the surrounding areas. When the carrier gas is passed through, the temperature of the central part decreases significantly, forming a central channel of the plasma. The atomized aerosol evaporates, atomizes, and excites in the central channel.

ICP-900 typeinductively coupled plasmaEmission spectrometer

Suitable for automotive urea aqueous solution/Automotive catalyst

The characteristics of ICP-900 fully automatic scanning plasma spectrometer:

1. The high-voltage power supply circuit of the RF generator adopts advanced electronic technology, eliminates bulky step-up transformers and high-frequency resistive coils, and adopts power closed-loop feedback technology, with control accuracy less than0.1% .

2. Fully automatic ignition gas path intelligent control, realizing software ignition, more convenient.

3. Safe cooling water protection, argon protection, overpressure, overcurrent, and arc extinguishing protection are safer.
4.Automatic matching and tuning of output power, power parametersSoftwareProgram settings
5.The spectrometer is filled with argon gas to achieve sensitive measurement of sulfur at 180nm wavelength and Sn at 189nm wavelength.

6.Excellent optical system, advanced control system, ensuring accurate peak position positioning and excellent signal-to-noise ratio、Minimal matrix effect.
7.Wide measurement range, analysis from trace to constant, dynamic linear range of 5-6 orders of magnitude.
8.The detection limit is low, and the detection limit of most elements can reach the ppb level.
9.Good measurement accuracy, stability, relative standard deviation RSD ≤ 1.5% (5ppm), superior to the national standard A (JJG768-2005).

technical parameter

Radio frequency generator (RF)

(1)Circuit type: self-excited oscillation circuit, fully automatic ignition, precision high-voltage switch power supply system, all functions are controlled by computer software (ignition, shutdown, power and other parameter settings); Real time power control; Automatic matching tuning; Constant temperature in the light chamber;；

(2) Working frequency: 40.68MHz ± 0.05%

(3) Frequency stability:< 0.1%

(4) Output power: 700-1600w

(5) Output power stability: ≤ 0.3%

(6) Electromagnetic field leakage radiation intensity: Electric field intensity E at a distance of 300mm from the fuselage< 2V/m

Sample injection device:

(1) Output working coil inner diameter 25mm, 3 turns

(2) Torch tube: Quartz torch tube with an outer diameter of 20mm

(3) Outer diameter of coaxial spray 6mm

(4) Double tube fog chamber outer diameter 35mm

(5) Specification of argon flowmeter and carrier gas pressure gauge:

① Plasma flowmeter (100-1000) L/h; (1.6-16L/min)

② Auxiliary gas flow meter (6-60) L/h; (0.1-1L/min)

③ Carrier gas flow meter (6-60) L/h; (0.1-1L/min)

④ Carrier gas stabilizing valve (0-0.4MPa)

The instrument is equipped with an argon secondary pressure regulator valve (0.3MPa)

Light metering device:

(1) Specification of photomultiplier tube: R212UH

(2) Negative high voltage of photomultiplier tube: 200-1000V, stability<0.05%

(3) Measurement range of photomultiplier tube current: 10-12-10-4A

(4) Signal acquisition is V/F exchange: 1mV corresponds to 100Hz

Spectrometer:
(1) Optical path:Czerny-Turner
(2) Focal length: 1000mm
(3) Grating specifications: ion etched holographic grating, with a line density of 3600 lines/mm,

Marking area: 80 × 110mm, reciprocal of linear dispersion rate: 0.26nm
(4) Wavelength range: 190-500nm
(5) Resolution: ≤ 0.008nm
(6) Scanning wavelength range: 3600 lines/mm Scanning wavelength range: 190-500nm
(7) Minimum step distance for stepper motor drive: 0.0006nm
(8) Incident slit: 20 µ m Exit slit: 25 µ m
(9) Transmitting mirror specification: (78 × 105 × 16) mm
(10) Lens ф 30, 1:1 imaging

Technical specifications of the whole machine:

1. Measurement wavelength range:

180-500nm 3600L/mm grating

180-800nm 2400 L/mm grating

1. Measurement accuracy (repeatability): average relative standard deviation RSD≤1%
2. Measurement stability: average relative standard deviationRSD≤2
3. Detection limit: sub PPb

Automotive urea aqueous solution/Automotive catalystICP/Inductive couplingSpectrometer Measurement Table

This instrument accord withGB29518-2013 Appendix G（Diesel engine nitrogen oxide reducing agent urea aqueous solution）Technical requirements;Can detectAutomotive urea aqueous solution/In automotive catalysts：calciumIron copper zinc chromium nickel aluminum magnesium potassium sodiumWaiting for the content of over 60 elements