2024年3月18日发(作者：联想昭阳k29笔记本参数)
Fixed and Volatile Solids Ignited at 550°C
——摘自美国国家标准
《Standard_Methods_for_the_Examination_of_Water_and_Wastewater 20th
Edition》
1. General Discussion
a. Principle: The residue from Method B, C, or D is ignited to constant weight
at 550°C.
The remaining solids represent the fixed total, dissolved, or suspended solids
while the weight
lost on ignition is the volatile solids. The determination is useful in control of
wastewater
treatment plant operation because it offers a rough approximation of the
amount of organic
matter present in the solid fraction of wastewater, activated sludge, and
industrial wastes.
b. Interferences: Negative errors in the volatile solids may be produced by
loss of volatile
matter during drying. Determination of low concentrations of volatile solids in
the presence of
high fixed solids concentrations may be subject to considerable error. In such
cases, measure for
suspect volatile components by another test, for example, total organic carbon
(Section 5310).
Highly alkaline residues may react with silica in sample or silica-containing
crucibles.
2. Apparatus
See Section 2540B.2, Section 2540C.2, and Section 2540D.2.
a. Evaporating dishes: Dishes of 100-mL capacity made of one of the
following materials:
1) Porcelain, 90-mm diam.
2) Platinum—Generally satisfactory for all purposes.
3) High-silica glass.#(44)*
b. Muffle furnace for operation at 550°C.
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