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H16752

Sigma-Aldrich

Humic acid sodium salt

technical grade

Synonym(s):

Humic acid Na salts, Sodium humates, Sodium salts humic acids

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About This Item

CAS Number:
68131-04-4
EC Number:
268-608-0
MDL number:
MFCD00135560
UNSPSC Code:
12352100
NACRES:
NA.22
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grade

technical grade

Quality Level

100

mp

>300 °C (lit.)

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General description

Humic acid possess excellent complexing ability with heavy metal.[1] Humic acid sodium salt acts as a proxy for humic-like substances that were identified as a major component of the isolated organic matter in the atmospheric aerosol.[1]

Humic acid sodium salt, also known as sodium humate is used to synthesize superabsorbents.[2]

Application

Humic acid sodium salt is suitable reagent used to study the hygroscopic growth of solid aerosol particles consisting of mixtures of ammonium sulfate, adipic acid and humic acid mixtures.[1] It is suitable reagent used to study the phase transitions and hygroscopic growth of humic acid aerosols by Fourier transform infra-red (FTIR) spectroscopy and tandem differential mobility analysis (TDMA).[3]

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
SDBB1544
STBL1737
STBK4947
STBK1706
STBJ7326

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Ralf Kautenburger et al.
Electrophoresis, 38(6), 930-937 (2016-12-07)
For the safe long-term storage of high-level radioactive waste (HLW), detailed information about geo-chemical behavior of radioactive and toxic metal ions under environmental conditions is important. Natural organic matter (NOM) can play a crucial role in the immobilization or mobilization
Hygroscopic growth and water uptake kinetics of two-phase aerosol particles consisting of ammonium sulfate, adipic and humic acid mixtures.
Sjogren S, et al.
Journal of Aerosol Science, 38(2), 151-171 (2007)
Adsorption of heavy metal ions onto insolubilized humic acid.
Seki H and Suzuki A.
Journal of Colloid and Interface Science, 171(2), 490-494 (1995)
Qin Xue et al.
Chemosphere, 224, 103-110 (2019-03-01)
Arsenic mobility in soils, sediments and groundwater systems is strongly controlled by adsorption occurring at iron oxide/water interfaces, and the extent of this adsorption may be influenced by the presence of natural organic matter (NOM). This study aims to investigate
Synthesis and characterization of chitosan-g-poly (acrylic acid)/sodium humate superabsorbent
Liu J, et al.
Carbohydrate Polymers, 70, 166-173 (2007)
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Questions

1–7 of 7 Questions  

  1. What's the difference between Product 53680 and Product H16752?

    1 answer

    1. Product 53680 is the free acid form while product H16752 is the sodium salt form of humic acid. Humic acids are strongly acidic and naturally occurring. Humic acids exist predominantly in their salt form. Product H16752 is treated with HCl resulting in the purified free acid form, product 53680.

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  2. What is the chemical formula of the humic acid salt? is it C9H8O4Na2? If not, what is the percentage of carbon in the humic acid salt?

    1 answer

    1. Humic acid is a natural source material and exists in nature primarily as the sodium form. This is a technical grade product and in-depth analysis has not been performed, including carbon content. It is composed of a polycyclic core (mostly aromatic), loosely bound polysaccharides, proteins, phenols and chelated metal ions. The molecular weight can range from 2kDa - 500kDa, with the bulk being 20kDa - 50kDa. PubChem lists the formula as C9H8NA2O4. This would be the core formula.

      Please refer to the link below for additional information from PubChem, including 2D and 3D core structures:
      https://pubchem.ncbi.nlm.nih.gov/compound/21908873

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  3. Is Product H16752, Humic acid sodium salt purified?

    1 answer

    1. This product is of natural mined origin. The only purification step is washing with deionized water.

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  4. What is the Department of Transportation shipping information for this product?

    1 answer

    1. Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.

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  5. What is the molecular weight of Product H16752, Humic acid sodium salt?

    1 answer

    1. This product has a molecular weight range of 2,000-500,000.

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  6. What are the impurities present in Product H16752, Humic acid sodium salt?

    1 answer

    1. Impurities are not determined for this product. The composition includeds polysaccharides, proteins, simple phenols, and chelated metal ions.

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  7. What is the source of Product H16752, Humic acid sodium salt?

    1 answer

    1. This product is the results from the decomposition of organic matter, particularly dead plants. It can be found in vegetable soil, peat, and/or soft coal.

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