1 , infrared spectrometer
(1) The sample must be pre-purified to ensure sufficient purity;
(2) The sample must be dehydrated in advance to avoid damage to the instrument and avoid interference of the water peak on the sample spectrum;
(3) For samples deliquescent, please place them in a desiccator;
(4) For samples that are volatile, sublimated, or unstable to heat, please cover and close with a container with a sealing cap or stopper.
2 , UV- visible absorption spectrometer
The concentration of the sample solution must be appropriate and must be clear and transparent, free of bubbles or suspended matter.
3, gas chromatograph
Samples that can be directly analyzed should be volatile and thermally stable. The boiling point is generally not more than 300 ° C. If it cannot be directly injected, it needs to be pretreated.
4, liquid chromatograph
Sample to be filtered
5 , ion chromatograph
The sample can be dissolved in water, or dilute acid or dilute alkali. The acid and base used should not contain the ions to be tested. For compounds containing the element to be tested in the sample but present in a non-ionic state in water, acid or alkali solution, the corresponding sample preparation is required.
6 , atomic fluorescence spectrometer
(1) General requirements for sample analysis
The objects analyzed by atomic fluorescence spectrometry are arsenic (As), selenium (Se), germanium (Ge), tellurium (Te), etc. and mercury (Hg) atoms in the ionic state. The sample must be an aqueous solution or soluble in acid.
(2) Solid sample
1 The inorganic solid sample is kept in proper acidity after simple dissolution.
Detection of arsenic (As), selenium (Se), strontium (Te), mercury (Hg), the medium is hydrochloric acid (5%, v / v);
Detection of germanium (Ge), the medium is sulfuric acid (5%, v/v);
Mercury (Hg) is detected, the medium can also be nitric acid (5%, v/v), and the detection (As) medium can also be sulfuric acid (2%, v/v).
Since copper, silver, gold, platinum and other metals interfere with the elements to be tested, arsenic, selenium, tellurium and mercury in the alloy samples should not be measured by the instrument.
2 organic or biological solid samples
The sample is nitrated to a solution and maintains the proper acidity, and the acidity of the medium is the same as that of the inorganic sample.
7 , gas chromatography- mass spectrometer
Samples entering the gas chromatograph must be fully vaporized over the operating temperature range of the column.
8 , liquid chromatography- mass spectrometer
(1) In order to ensure accurate and reliable analysis results, the sample is required to be completely dissolved, and no mechanical impurities are allowed.
(2) When liquid chromatography-mass spectrometry is used, all buffer systems are uniformly formulated with a volatile buffer such as acetic acid, ammonium acetate, tetrabutylammonium hydroxide or the like.
9 , elemental analyzer
The sample must be a homogeneous solid particulate or liquid that does not contain adsorbed water and is purified. If the sample is impure (including adsorbed water, organic solvents, inorganic salts or other impurities), the analysis results will be affected, and the test values ​​will not match the calculated values;
The sample should be of sufficient quantity to meet the linearity and sensitivity of the method and instrument.
10 , organic mass spectrometer
It is suitable for the analysis of liquid and solid organic compound samples with a relative molecular mass of 50~2000u. The sample should be as pure a single component as possible.
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Likewise, we are not only certified with ISO9001, ISO13485 but also fully complied with the essential USFDA, CE Compliances, as well as obtaining relevant accreditation of FDA510K, EN455, and EN374.
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