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    Home > Technical Information

    Determination of suspended matter in circulating water

    Source: Author: Time: 2018-03-14 Views: Times

    Suspended matter in circulating water

    1

    method one

    Subtraction

    1

    )

    Scope of application

    This method is applicable to raw water,

    Circulating cooling water,

    Condensate and furnace water.

    The presence of suspended matter can block the pipeline

    The plug will cause sediments in the heat exchanger and the boiler, which will affect the heat exchange efficiency.

    2

    )

    Measurement principle

    Suspended solids are solids that cannot pass the filter in a water sample.

    Available total solids and total dissolved solids

    The difference calculation is sufficient.

    Suspended matter

    mg / L

    )

    =

    Total solids

    mg / L

    )

    -

    Dissolved solids

    mg / L

    ).

    2.14.2

    Method Two

    Glass sand core funnel method

    1

    ) Application

    This method is applicable to the determination of suspended matter in natural water, circulating water and industrial sewage.

    2

    )

    Measurement principle

    Suspended matter is solid matter that cannot pass through the filter. After the water sample is filtered through a glass sand core funnel in this method,

    in

    105

    ~

    110

    Dry the filter residue at ℃ and weigh it.

    3

    )

    Reagent

    3.1

    )

    Acid asbestos

    3.2

    )

    1 + 1

    Nitric acid

    4

    )instrument

    4.1

    ) Glass Sand Core Funnel (

    G3

    or

    G4

    )

    4.2

    ) Water pump and filter bottle

    5

    )

    Handling of glass sand core funnels

    Glass funnel

    1 + 1

    Nitric acid washing,

    Wash with distilled water,

    Laying a layer while filtering

    3

    ~

    5mm

    Thick

    Acid asbestos, compact with glass rod,

    105

    ~

    110

    Constant temperature at ℃, put in a desiccator for later use.

    6

    )

    Analysis steps

    Fix the treated glass sand core funnel to the suction filter bottle,

    Take a proper amount of well-shake water sample and filter

    (take

    The sample amount depends on the suspended matter content.

    20

    ~

    50mg / L

    Above, desirable

    1

    Liter or more

    Water sample

    Content in

    50mg / L

    the above,

    Desirable

    500mL

    Or less watery)

    ,

    in

    105

    ~

    110

    Dry for more than an hour to constant weight.

    7

    )

    Calculation

    6

    1

    2

    10

    /

    V

    m

    m

    L

    mg

    )

    Suspended matter

    In the formula:

    m

    1

    — The quality of the treated glass sand core funnel,

    g

    ;

    m

    2

    — The quality of the funnel of suspended solids and glass sand core

    g

    ;

    V

    —Sampling volume,

    mL

    .

    8

    )

    Precautions

    8.1

    )

    in

    105

    ~

    110

    The drying time at ℃ mainly depends on the amount of suspended matter.

    2

    Hours after taking out and put in a desiccator

    30

    minute,

    Weigh on a ten-thousandth scale,

    Put it again

    105

    ~

    110

    Under baking

    30

    Minutes, remove and put in the dryer

    30

    Weigh in minutes and repeat this process until constant weight.

    8.2

    )

    The filtrate should be clear and transparent after filtration.

    If turbid, return to the glass sand core funnel and filter again

    (filter paper

    The rule is filtered with double-layer filter paper).

    8.3

    )

    If the amount of suspended matter is

    20mg / L

    The following calculation can be made by the difference between total solids and dissolved solids.

    8.4

    )

    The filter pore size has a great effect on the result and cannot be arbitrarily replaced.

    0

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