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S9638 Sigma-Aldrich

Sodium phosphate monobasic monohydrate

ACS reagent, ≥98%

Synonym: Monosodium phosphate, Sodium dihydrogen phosphate monohydrate



Related Categories ACS Grade Buffers, Biochemicals and Reagents, Biological Buffers, Buffers A to Z, Chemical Synthesis,
grade   ACS reagent
assay   ≥98%
impurities   ≤0.01% Insoluble matter
pH   4.1-4.5 (25 °C, 5% in solution)
anion traces   chloride (Cl-): ≤5 ppm
  sulfate (SO42-): ≤0.003%
cation traces   Ca: ≤0.005%
  Fe: ≤0.001%
  K: ≤0.01%
  heavy metals (as Pb): ≤0.001%


Other Notes

A -D suffix exists for administrative purposes only.
All -D packages are 100% the same product, same quality, same specification as the package sizes previously sold without a -D.


1, 6×1, 3 kg in poly bottle

25, 250, 500 g in poly bottle

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Safety & Documentation

Safety Information

WGK Germany 


Certificate of Analysis

Certificate of Origin

Protocols & Articles


EPA Method 335.4 Product Selection Guide

This product selection guide is designed to simplify the ordering of products for EPA Method 335.4. This method is for the determination of total cyanide in various water and waste samples.


Enzymatic Assay Of Alcohol Dehydrogenase Attached To Agarose (A2529)

1. OBJECTIVE The objective of this procedure is to standardize the enzymatic assay of Alcohol Dehydrogenase attached to Agarose, Sigma Product Number (A2529) , at Sigma-Aldrich St. Louis.
Keywords: Extinction coefficient

Enzymatic Assay of Alcohol Dehydrogenase (EC

This procedure may be used for Alcohol Dehydrogenase products, except for Alcohol Dehydrogenase, Insoluble Enzyme attached to beaded agarose (Catalog No. A2529).
Keywords: Extinction coefficient

Peer-Reviewed Papers


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Effects of prolonged neuronal nitric oxide synthase inhibition on the development and expression of L-DOPA-induced dyskinesia in 6-OHDA-lesioned rats. Padovan-Neto FE, Cavalcanti-Kiwiatkoviski R, Carolino RO, et al. Neuropharmacology 89, 87-99, (2014)


Salt effects in electromembrane extraction. Seip KF, Jensen H, Kieu TE, et al. J. Chromatogr. A. 1347, 1-7, (2014)


Polymeric nanocarriers for siRNA delivery to murine macrophages. Forbes DC, Peppas NA, et al. Macromol. Biosci. 14(8), 1096-105, (2014)


Metabolism of methylstenbolone studied with human liver microsomes and the uPA?/?-SCID chimeric mouse model. Geldof L, Lootens L, Polet M, et al. Biomed. Chromatogr. 28(7), 974-85, (2014)


The influence of spray-drying parameters on phase behavior, drug distribution, and in vitro release of injectable microspheres for sustained release. Meeus J, Lenaerts M, Scurr DJ, et al. J. Pharm. Sci. 104(4), 1451-60, (2015)


Cisplatin-induced duplex dissociation of complementary and destabilized short GG-containing duplex RNAs. Polonyi C, Alshiekh A, Sarsam LA, et al. Dalton Trans. 43(31), 11941-9, (2014)


Evaluation of amino acid ester-based ionic liquids as buffer additives in CE for the separation of 2-arylpropionic acids nonsteroidal anti-inflammatory drugs. Mavroudi MC, Kapnissi-Christodoulou CP, et al. Electrophoresis 35(18), 2573-8, (2014)


Performance characterization of a quantitative liquid chromatography-tandem mass spectrometric method for 12 macrolide and lincosamide antibiotics in salmon, shrimp and tilapia. Dickson LC J. Chromatogr. B. Analyt. Technol. Biomed. Life Sci. 967, 203-10, (2014)


A 3D-printed device for a smartphone-based chemiluminescence biosensor for lactate in oral fluid and sweat. Roda A, Guardigli M, Calabria D, et al. Analyst 139(24), 6494-501, (2014)


Monitoring and preparation of neoagaro- and agaro-oligosaccharide products by high performance anion exchange chromatography systems. Kaz?owski B, Pan CL, Ko YT, et al. Carbohydr. Polym. 122, 351-8, (2015)


Activation of serotonin2A receptors in the medial septum-diagonal band of Broca complex enhanced working memory in the hemiparkinsonian rats. Li LB, Zhang L, Sun YN, et al. Neuropharmacology 91, 23-33, (2015)


Feasibility of ultra-high performance liquid and gas chromatography coupled to mass spectrometry for accurate determination of primary and secondary phthalate metabolites in urine samples. Herrero L, Calvarro S, Fernández MA, et al. Anal. Chim. Acta 853, 625-36, (2014)


An improved liquid chromatography-tandem mass spectrometric method to quantify formoterol in human urine. He G, Lu J, Wang X, et al. J. Chromatogr. Sci. 52(8), 848-51, (2014)


The isotope method for the determination of stoichiometry between compounds forming the polypyrrole and glucose oxidase composite. Garbaras A, Mikoliunaite L, Popov A, et al. Phys. Chem. Chem. Phys. 17(3), 2252-8, (2014)


Evaluation of enantiomeric purity of magnesium-L-aspartate dihydrate. Wahl O, Holzgrabe U, et al. J. Pharm. Biomed. Anal. 102, 100-9, (2014)


Validation and application of an UPLC-MS/MS method for the quantification of synthetic cannabinoids in urine samples and analysis of seized materials from the Portuguese market. Simões SS, Silva I, Ajenjo AC, et al. Forensic Sci. Int. 243, 117-25, (2014)


Merck 14,8660

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