PYRIDINE

Azabenzene

110-86-1

Azine

Pyridin

Piridina

Pirydyna

Pyridin [German]

Pirydyna [Polish]

Piridina [Italian]

RCRA waste number U196

Caswell No. 717

NCI-C55301

FEMA No. 2966

FEMA Number 2966

CCRIS 2926

HSDB 118

CHEBI:16227

CP 32

EINECS 203-809-9

NSC 406123

pyridine-ring

pyridine-

UNII-NH9L3PP67S

NH9L3PP67S

EPA Pesticide Chemical Code 069202

DTXSID9021924

AI3-01240

NSC-141574

NSC-406123

PYRIDINE (15N)

DTXCID101924

EC 203-809-9

MFCD00011732

PYRIDINE (IARC)

PYRIDINE [IARC]

Pyridine [UN1282] [Flammable liquid]

PYRIDINE (USP-RS)

PYRIDINE [USP-RS]

Pyridine, ACS reagent, >=99.0%

Pyridine, ReagentPlus(R), >=99%

UN1282

CEFTAZIDIME IMPURITY F (EP IMPURITY)

CEFTAZIDIME IMPURITY F [EP IMPURITY]

RCRA waste no. U196

CEFTAZIDIME PENTAHYDRATE IMPURITY F (EP IMPURITY)

CEFTAZIDIME PENTAHYDRATE IMPURITY F [EP IMPURITY]

hydropyridine

N-pyridine

pyridine fraction

3-pyridinyl

[pyridine]

2-pyridine

4-pyridine

Pyridine II

Pyridine III

3-Pyridine

Pyridine anhydrous

Azabenzene; Azine

0PY

Pyridine, anhydrous

Pyridine, 99%

Pyridine, ACS reagent

Pyridine, >=99%

Pyridine, HPLC Grade

PYRIDINE [FHFI]

PYRIDINE [HSDB]

PYRIDINE [MI]

bmse000432

Epitope ID:140099

WLN: T6NJ

Pyridine, p.a., 99%

NCIOpen2_002809

NCIOpen2_007786

NCIOpen2_007866

NCIOpen2_007986

NCIOpen2_007999

Pesticide Code: 069202

Pyridine, LR, >=99%

Pyridine, analytical standard

Pyridine, anhydrous, 99.8%

CHEMBL266158

Pyridine, AR, >=99.5%

Pyridine, >=99.5% (GC)

DTXSID101318102

BCP23599

Pyridine, for HPLC, >=99.9%

Tox21_200960

BDBM50176909

NSC141574

NSC406123

Pyridine, anhydrous Water 30ppm Max

STL264195

AKOS000120998

MCULE-4028120692

Pyridine, biotech. grade, >=99.9%

UN 1282

NCGC00091476-01

NCGC00091476-02

NCGC00258513-01

Pyridine, SAJ first grade, >=99.0%

BP-13452

CAS-110-86-1

NCI60_006101

Pyridine, JIS special grade, >=99.5%

Pyridine, p.a., ACS reagent, 99.0%

Pyridine, purification grade, >=99.75%

DB-220141

Pyridine, spectrophotometric grade, >=99%

NS00010113

Q0034

EN300-17264

C00747

A802257

Q210385

J-002482

InChI=1/C5H5N/c1-2-4-6-5-3-1/h1-5

F0001-0227

Pyridine, puriss. p.a., ACS reagent, >=99.8% (GC)

Pyridine, suitable for hydroxyl value determination, >=99.5%

Pyridine; Azabenzene; Azine; CP 32; NSC 141574; NSC 406123

Pyridine, Pharmaceutical Secondary Standard; Certified Reference Material

Pyridine, puriss. p.a., ACS reagent, reag. Ph. Eur., >=99.5% (GC)

0.25 M Hyacinth BMT solution BMT in anhydrous Acetonitrile, NC-0102 emp Biotech GmbH

Pyridine, puriss., absolute, over molecular sieve (H2O <=0.005%), >=99.8% (GC)

Pyridine, puriss., Reag. Ph. Eur., dried, >=99.5% (GC), <=0.0075% water

Solvent Mix Pyridine in ACN (V / V = 60 : 40) NC-0612, GL45 thread emp Biotech GmbH

29761-81-7

Pyridine for oligo synthesis (Water content < 30 ppm) NC-0604 2.5 L GL45 thread emp Biotech GmbH

The Henry's Law constant for pyridine is 1.1X10-5 atm-cu m/mole(1). This Henry's Law constant indicates that pyridine is expected to volatilize from water surfaces(2). Based on this Henry's Law constant, the volatilization half-life from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec)(2) is estimated as 3 days(SRC). The volatilization half- life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(2) is estimated as 25 days(SRC). Pyridine's Henry's Law constant(1) indicates that volatilization from moist soil surfaces may occur(SRC). Pyridine is a weak base with a pKa of 5.23(3), which indicates this compound will partially exist in the protonated form in acidic conditions, and no volatilization from water or moist soil will occur for the cation(SRC). The potential for volatilization of pyridine from dry soil surfaces may exist(SRC) based upon a vapor pressure of 20.8 mm Hg(4).
Literature: (1) Hawthorne SB et al; Environ Sci Technol 19: 922-927 (1985) (2) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 15-1 to 15-29 (1990) (3) Bintein S, Devillers J; Chemosphere 28: 1171-88 (1994) (4) Daubert TE, Danner RP; Physical and Thermodynamic Properties of Pure Chemicals Data Compilation Washington, DC: Taylor and Francis (1989)

The Koc of pyridine is estimated as 50(SRC), using a measured log Kow of 0.65(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that pyridine is expected to have high mobility in soil. The pKa of pyridine is 5.23(4), which indicates that pyridine will partially exist in the protonated form under acidic conditions and cations adsorb more strongly to soil surfaces than neutral molecules(SRC). The adsorption of pyridine to a basic subsoil (pH 8.15, 0.58% organic carbon) is negligible, while in an acidic subsoil (pH 4.85, O.24% organic carbon), the Freundlich adsorption constant was measured to be 5.78 and the slope 0.679(5). This suggests a cationic adsorption mechanism as pyridine is predominantly in its protonated form. Pyridine adsorbs to colloidal particles of sodium montmorillonite and kaolinite, a process which is attributed to cation exchange and is a function of pH(5). Adsorption is at a minimum at pH 1 and 11 and reaches a maximum at pH 4 for the montmorillonite and pH 5.5 for the kaolinite where the adsorption constants are 60 and 10, respectively(6).
Literature: (1) Hansch C et al; Exploring QSAR. Hydrophobic, Electronic, and Steric Constants. ACS Prof Ref Book. Heller SR, consult. ed., Washington, DC: Amer Chem Soc p. 12 (1995) (2) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 4-9 (1990) (3) Swann RL et al; Res Rev 85: 17-28 (1983) (4) Bintein S, Devillers J; Chemosphere 28: 1171-88 (1994) (5) Felice LJ et al; Quinoline Partitioning In Substance Materials Adsorption, Desorption, and Solute Competition PNL-SA-11728 Battelle Pacific NW Labs pp. 19 (1984) (6) Baker RA, Lu MD; Water Res 5: 839-48 (1971)