(1) The instrument should be placed in a moisture-proof, dust-proof, shock-proof, non-corrosive gases, the relative humidity of the air is less than 70%, good ventilation laboratory.
(2) The main body of the instrument must be placed on a fixed platform, about 0.5m away from the wall, to avoid direct sunlight.
(3) the host should be installed above the smoke window exhaust hood, exhaust hood from the host smoke window about 25cm, as far as possible to prohibit the direct connection to the instrument smoke window, the pipeline should be made of corrosion-resistant materials, exhaust to the right amount.
(4) the host and accessories of the power supply is best through an electronic AC voltage regulator, voltage stabilization and then into the instrument, the instrument should be grounded.
(5) All gas piping should be clean, oil-free, pressure-resistant, air piping should be installed "air filtration and pressure reducing valve". The joints of each pipeline should be sealed, secure, and checked by the leakage test.
(6) 30cm below the atomization chamber, the 13-18cm long drain pipe bent into a circle, filled with a certain amount of water as a water seal. One end of the tube is linked to the waste liquid outlet of the nebulizing chamber, firmly clamped with a clip, and the other end is immersed into the waste liquid bottle about 15cm below the liquid level. The waste liquid drainage conduit should be kept free from obstruction at all times.
2. Commissioning
Commissioning instrument should be selected wavelength greater than 250nm, radiation intensity, luminous stability, the flame state of the slow response to the elemental lamp as a light source, preferably copper lamps, magnesium, nickel and other elements of the lamp can also be.
(1) to the light adjustment
① light source to the light
Turn on the 220V power supply, turn on the AC voltage regulator, light an elemental lamp, adjust the wavelength of the monochromator to the most sensitive line position of the element, so that the instrument has a signal output. Move the position of the lamp so that the receiver gets the maximum light intensity. Check with a piece of white paper blocking the light, the cathode spot should be focused imaging in the center of the burner gap or slightly closer to the monochromator side.
②Burner to light
The burner slit is located under and parallel to the optical axis, which can be achieved by changing the burner front and back, corner, horizontal position.
First adjust the head pointer full scale, with a light stick or matchstick inserted in the center of the burner gap, the head pointer should be from the maximum back to zero, that is, the light transmission from 100% to 0%, and then place the light stick or matchstick vertically at the ends of the gap, indicating that the indication of the transmittance should be reduced to 20%-30%, such as less than the above indicators, should be the position of the burner and then slightly adjusted until it meets the requirements.
Also, the burner should be slightly adjusted until it meets the requirements.
You can also ignite the flame, spray the standard solution of the element, adjust the position of the burner, to the maximum absorbance until.
(2) sprayer adjustment
Sprayer in the capillary and throttle nozzle relative position and concentricity is the key to adjusting the sprayer, capillary mouth and throttle nozzle concentricity higher, the finer the droplets, the higher the atomization efficiency.
Generally, you can determine the effect of adjustment by observing the spray condition, disassemble the sprayer, take a piece of filter paper, the fog sprayed on the filter paper, the filter paper is slightly wet is just the right position.
Some instruments are adjustable sprayer, in the absence of ignition, the first sprayer will be adjusted to the position of the reverse spray, that is, inserted into the liquid surface of the capillary tube appeared bubbles, and then ignite the flame spray standard liquid, move slowly in the opposite direction, to get the maximum absorbance can be fixed.
(3) collision ball adjustment
Collision ball position to low noise, high sensitivity is good. Will be removed from the sprayer, suction spray distilled water, change the position of the collision ball, when the fog sprayed far and fine, and slowly rotate forward, it is its best position.
This adjustment is more difficult, generally use the factory position is no longer adjusted.
The amount of sample extraction refers to the number of milliliters of the solution absorbed per minute, expressed as ml/min, the amount of solution extraction and absorbance is not a linear relationship between the 4-6 ml/min has the best absorption sensitivity, greater than 6 ml/min sensitivity instead of decreasing.
By changing the speed of the spray airflow and the inner diameter and length of the polyethylene capillary, the sample extraction volume can be adjusted to adapt to a variety of different solution spray.
(5)Test items
①StabilityFor more related information, analytical data, please refer to the spectral analysis of standard substances/plist_1/plist_1_29_0_1.html