Overview of Inductive Coupling Contour Sub-body Emission Spectrometer

1.

Inductively coupled plasma emission spectrometry (ICP-AES) analysis process: excitation, spectroscopy and detection

2.

(1) Sampling system: mainly composed of peristaltic pump, atomizer and spray chamber

(2) High-frequency generator and induction coil: Use high-frequency current to couple through inductance (induction coil) to ionize and heat the working gas to produce flame-like plasma

(3) Torch tube and gas supply system: the torch tube is a three-layer concentric quartz tube; the cooling gas is introduced into the outer tube along the tangential direction, and it is mainly used for cooling; the auxiliary gas flows into the middle tube along the tangential direction, and the role is to "ignite" Plasma; the carrier gas is introduced from the atomizer to convert the sample solution into an aerosol with a particle size of only 1-10um

(4) Spectrometer and detector: photomultiplier tube and solid-state imaging device

(5) Data processing system: computer, instrument control and data processing software

3.

(1) Simultaneous detection of multiple elements and multiple spectral lines per element

(2) The measurement range is wide

(3) Good selectivity

(4) Less sample consumption

(5) The analysis speed is fast

(6) Common non-metal elements such as oxygen, sulfur, nitrogen, halogen and other spectral lines are in the far ultraviolet region, which cannot be detected by general spectrometers; there are also some non-metal elements, such as P, Se, Te, etc.

(7) Main interference control methods:

Physical interference: matrix matching, internal standard method, a standard addition method

Ionization interference matrix the interference effects: increased power, reducing the carrier gas flow rate, observed reduced height, to increase the plasma temperature; matrix matching standard addition method, and the like
.

Spectral Interference: deduction of background correction; high-resolution spectrometer as a select low interference spectral analysis line; interference factor correction method or the like
.

4.
Matters needing attention

(1) Keep the light chamber and C1D detector clean
.
Turn on the oxygen cylinder 1h before starting the spectrometer to purge the light chamber and CID detector; after turning off the flame, you must continue to turn on the gas to purge the CID detector for 20 minutes
.

(2) Torch tube: The torch tube will become dirty after a period of use, and there are attachments on the surface.
It can be soaked in dilute nitric acid with a volume fraction of 5%-10% for 2~3h, then rinsed with deionized water, dried and installed
.

(3) For quantitative determination, the temperature of the time chamber must reach and stabilize at 38℃±0.
2℃
.

(4) Regularly replace the cooling circulating water: the replacement period is six months to one year
.
Other vacuum pump oils and molecular sieves are replaced regularly
.

(5) When the gas is stopped and the flame is stopped, the gas source should be replaced immediately, and the CID can be purged at room temperature for 2 to 4 hours before re-ignition analysis and determination
.
Do not immediately ignite and analyze after replacing the new gas source
.

(6) Inspection and cleaning of the sampling system after the measurement; the torch, atomizer, and spray chamber must be cleaned frequently; the waste liquid bucket and waste liquid must be cleaned frequently
.

(7) Check the atomizer to see if there is any blockage, and clean the atomizer and central tube in time
.

(8) Replace the pump tube regularly, and keep the pump clamp slack during the non-ignition period
.

(9) The sample must be clear and transparent, otherwise it is easy to block the atomizer; in case the atomizer is blocked, never use metal wires to clean foreign objects
.

(10) After the sample is measured, rinse with dilute nitric acid with a volume fraction of 3% to 5% for 5 minutes, then rinse with deionized water for 5 minutes, then extinguish the plasma, and loosen the pump clamp
.