Detailed product
Product description
1. display mode: dual channel LCD liquid crystal display reading;
2. measuring element keyboard can be free to choose;
3. measuring elements: potassium, sodium, lithium;
4. calibration curve: stitches method, straight line method;
5. measuring range: range adjustment: K:0-15 mu g/ml, 0-40 g/ml, 0-60 g/ml, 0-100 / g/ml; Na:0-40 g/ml, 0-80 g/ml, 0-120 g/ml, 0-160 / g/ml; Ca:0-1000 g/ml
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Working principle
Flame photometric method is based on the Rome gold formula for quantitative analysis, i.e. B I=aXc, I line intensity of C, is the content of the measured elements, D is to be measured and elements of evaporation and excitation conditions on B constant; for the self absorption coefficient for flame excitation source the temperature, by controlling the flow of air and gas to maintain stability, because of the use of liquid sample, less sample components, so in the determination of a is a constant, generally due to the sample concentration is low, the self absorption is negligible, so I= lambda C, and the measurement methods available relative strength analysis.
Flame photometric analysis, the liquid atomizer for into the sol import flame, elements to be tested because of thermal dissociation generates ground atoms in the flame, was inspired by the monochromator spectrum decomposition into monochromatic light through the photoelectric measurement system, the flame of the humidity is relatively low, therefore can only stimulate minority elements. And the spectrum is relatively simple, less interference, flame photometric method is particularly suitable for easily excited alkali metal and alkaline earth metal.
In the determination, in order to stabilize the flame and eliminate the interference of some elements, often in the determination of liquid in the "buffer", such as K, Ca, Mg and between the determination of impact, if these three kinds of elements with saturated solution as "buffer", the solution to a certain amount, effect is generated is a single constant value, can be used for background subtraction, measurement of sodium, a large number of HCO32- can make the result is low, heating to remove hydrochloric acid solution available.
influence factor
Lamp current
Flame atomic absorption spectrophotometer using light source are hollow cathode lamp, hollow cathode lamp has a lamp current operating parameters. The lamp current determines light radiation intensity. Increase the current headlights in a certain range can be increased at the same time, radiation intensity, light stability and the signal-to-noise ratio is also increased, but decreased the sensitivity of the instrument. If the lamp current is too large, will cause the lamp itself from the corrosion phenomenon and shorten the service life of the lamp; the discharge is not normal, the light radiation intensity is not stable. On the contrary, reducing the lamp current can reduce the radiation intensity in a certain range, the sensitivity increased, but the light stability and decreased signal-to-noise ratio. If the lamp current is too low, and can make the lamp radiation intensity, resulting in a serious decline in stability and the signal-to-noise ratio to be used. Therefore, in the detection of specific work, such as the measured sample concentration was higher than the current headlights use, in order to achieve good stability; as the tested samples of low concentration, while maintaining stability to meet the requirements of the premise, the use of the lamp current is low, in order to obtain better sensitivity.