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    Home > Chemicals Industry > Chemical Technology > Soil and sediment aqua regia extraction-inductively coupled plasma mass spectrometry (1)

    Soil and sediment aqua regia extraction-inductively coupled plasma mass spectrometry (1)

    • Last Update: 2022-03-01
    • Source: Internet
    • Author: User
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    (1) Scope of application

    Suitable for cadmium (Cd), cobalt (Co), copper (Cu), chromium (Cr), manganese (Mn), nickel (Ni), lead (Pb), zinc (Zn), vanadium (V) in soil and sediment ), arsenic (As), aluminum (Mo), antimony (Sb), a total of 12 metal elements
    .
    The detection limit and lower limit of the method specified in HJ803-2016 are shown in Table 5-44

    .

    Table 5-44 Method detection limit and lower limit of determination specified in HJ803-2016

    (2) Method principle

    After the soil and sediment samples are digested with a mixed solution of hydrochloric acid / nitric acid (aqua regia) by an electric hot plate or a microwave digester, they are detected by an inductively coupled plasma mass spectrometer
    .
    Qualitatively based on the mass spectra or characteristic ions of the elements, and quantified by internal standard method

    .
    After the sample is brought into the atomization system by the carrier gas for atomization, the Japanese standard element enters the axial channel of the plasma in the form of aerosol, and is fully evaporated, dissociated, originalized and ionized in the high temperature and inert gas.
    The charged positive ions enter the mass spectrometer through the ion acquisition system, and the mass spectrometer separates and analyzes qualitatively and quantitatively according to the mass-to-charge ratio of the ions

    .
    Within a certain mass concentration range, the response value corresponding to the ion's mass-to-charge ratio is proportional to its mass concentration

    .

    (3) Reagents and materials

    Unless otherwise specified, the analysis uses pure reagents that meet the national standards
    .
    The experimental water is freshly prepared deionized water or water of equivalent purity

    .

    (1) Hydrochloric acid : p(HCl)=1.
    19g/mL;
    nitric acid : p(HNO 3 )=1.
    42g/mL,

    (2) Hydrochloric acid-nitric acid solution: 3+1 (ie industrial water)
    .

    (3) Nitric acid solution: c(HNO 3 )=0.
    5mol/L

    .

    (4) Nitric acid solution: 2+98
    .

    (5) Nitric acid solution: 1+4
    .

    (6) Slow quantitative filter paper
    .

    (7) Carrier gas: Argon, purity ≥99.
    999%

    .

    (4) Instruments and equipment

    (1) Inductively coupled plasma mass spectrometer: The mass range that can be scanned is 5 to 250 amu, and the peak width at 10% of the peak height should be 0.
    6 to 0.
    8 amu

    .

    (2) Temperature control electric heating plate: The control accuracy is ±0.
    2℃, and the maximum temperature can be set to 250℃

    .

    (3) Microwave digestion instrument: output power 1000~1600W
    .
    With programmable control function, temperature, pressure and time (heating time and holding time) can be monitored in the whole process; with safety protection function

    .

    (4) Analytical balance: the accuracy is 0.
    0001g

    .

    (5) Teflon closed digestion tank: it is resistant to pressure, acid and corrosion, and has a pressure relief function
    .

    (6) Centrifuge
    .

    (7) general laboratory equipment and instruments used, including conical flask, funnel glass, flask, nylon sieve
    .

    Related Links: Determination of Metal Elements in Solid Waste by Inductively Coupled Plasma Mass Spectrometry (4)

     

     

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