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parathion (Ref: OMS 19)
** thiophos ** parathion-ethyl ** ENT 15108 ** BAY 9491 ** Translations

Environmental Fate - Ecotoxicology - Human Health - A to Z Index - Home

GENERAL INFORMATION
for parathion

Description: An insecticide and acaricide used to control sucking and chewing insects and mites

Introduction: circa 1950

EC Regulation 1107/2009 (repealing 91/414):
Status Not approved
Dossier rapporteur/co-rapporteur Italy
Date inclusion expires Expired

Approved for use () or known to be used () in the following European countries:

AT

BE

BG

CY

CZ

DE

DK

EE

EL

ES

FI

FR

HU

IE

IT

LT

LU

LV

MT

NL

PL

PT

RO

SE

SI

SK

UK

General status:
Pesticide type Insecticide, Acaricide
Substance group Organophosphate
Substance origin Synthetic
Mode of action Non-systemic with contact, stomach and some respiratory action. Acetylcholinesterase (AChE) inhibitor.
CAS RN 56-38-2
EC number 200-271-7
CIPAC number 10
US EPA chemical code 057501
Chiral molecule No
Chemical formula C10H14NO5PS
SMILES S=P(Oc1ccc(cc1)[N+]([O-])=O)(OCC)OCC
International Chemical Identifier key (InChIKey) LCCNCVORNKJIRZ-UHFFFAOYSA-N
International Chemical Identifier (InChI) InChI=1S/C10H14NO5PS/c1-3-14-17(18,15-4-2)16-10-7-5-9(6-8-10)11(12)13/h5-8H,3-4H2,1-2H3
Structure diagram/image available? Yes
Molecular mass (g mol-1) 291.26
PIN (Preferred Identification Name) -
IUPAC name O,O-diethyl O-4-nitrophenyl phosphorothioate
CAS name O,O-diethyl O-(4-nitrophenyl) phosphorothioate
Other status information PIC Annex III; Potential groundwater contaminant; Marine Pollutant; Rotterdam Convention (Class Ia)
Herbicide Resistance Classification (HRAC) Not applicable
Herbicide Resistance Classification (WSSA) Not applicable
Insecticide Resistance Classification (IRAC) 1B
Fungicide Resistance Classification (FRAC) Not applicable
Physical state Pale yellow liquid
Related substances & organisms -

Formulations:
Property Value
Example manufacturers & suppliers of products using this active
  • King Tech
  • Fujian Sannong Group Co. Ltd.
  • Chimac-Agriphar S.A.
Example products using this active
  • Woprophos
  • Fighter
  • Co-thion
UK LERAP status No UK approval for use or outside scope
Formulation and application details Available in a variety of formulations including dusts, emulsion concentrates, granules, ULV liquids and wettable powders.


ENVIRONMENTAL FATE

for parathion

Property Value Source/Quality Score/Other Information Interpretation
Solubility - In water at 20oC (mg l-1) 12.4 G4 Low
Solubility - In organic solvents at 20oC (mg l-1) 200000 L3 - Dichloromethane -
200000 L3 - Toluene -
75000 L2 - Hexane -
200000 L3 - Isopropanol -
Melting point (oC) 6.1 L3 -
Boiling point (oC) 375 L3 -
Degradation point (oC) - - -
Flashpoint (oC) 174 L3 -
Octanol-water partition coefficient at pH 7, 20oC P 6.76 X 1003 Calculated -
Log P 3.83 G4 High
Bulk density (g ml-1)/Specific gravity 1.26 AC4 -
Dissociation constant (pKa) at 25oC - - -
Note:
Vapour pressure at 25oC (mPa) 0.89 L3 Non-volatile
Henry's law constant at 25oC (Pa m3 mol-1) 3.02 X 10-02 L3 Non-volatile
Henry's law constant at 20oC (dimensionless) 2.50 X 10-05 K3 Moderately volatile
GUS leaching potential index 2.09 Calculated Transition state
SCI-GROW groundwater index (μg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate Value 2.67 X 10-02 Calculated -
Note -
Potential for particle bound transport index - Calculated Medium
Maximum UV-vis absorption L mol-1 cm-1 - - -
Surface tension (mN m-1) - - -

Degradation:
Property Value Source/Quality Score/Other Information Interpretation
Soil degradation (days) (aerobic) DT50 (typical) 49 K4 Moderately persistent
DT50 (lab at 20oC) 14 F3 Non-persistent
DT50 (field) 17 AC4 Non-persistent
DT90 (lab at 20oC) - - -
DT90 (field) - - -
Note ICULID datasheet DT50 lab studies 3-32 days, field studies DT50 range 2-58 days; Other sources: 7DT50 -10 days (R3)
Aqueous photolysis DT50 (days) at pH 7 Value 30 AC4 Stable
Note -
Aqueous hydrolysis DT50 (days) at 20oC and pH 7 Value 260 L3 Persistent
Note pH sensitive: DT50 272 days at pH 4, 130 days at pH 9, all at 22 degC
Water-sediment DT50 (days) 4.3 K4 Fast
Water phase only DT50 (days) 3.5 K4 Moderately fast

Soil adsorption and mobility:
Property Value Source/Quality Score/Other Information Interpretation
Linear Kd - H3 Non-mobile
Koc 7660
Notes and range Other sources: 316.2-15849 mL/g (R3)
Freundlich Kf 17 R4 Slightly mobile
Kfoc 580
1/n 0.95
Notes and range Kf range 13.0-21.0 (229 for peat) mL/g, Kfoc range 491-636 (355 for peat) mL/g, 1/n - no data, Soils=4
pH sensitivity -


ECOTOXICOLOGY

for parathion

Property Value Source/Quality Score/Other Information Interpretation
Bio-concentration factor BCF 40 P4 (Other literature values Log BCF range 1.1-1.9 (R3)) Low potential
CT50 (days) <0.5 -
Bioaccumulation potential - Calculated Low
Mammals - Acute oral LD50 (mg kg-1) 2 G4 Rat High
Mammals - Short term dietary NOEL (mg kg-1) - L2 Rat, 2 year -
(ppm diet) 2 -
Birds - Acute LD50 (mg kg-1) 2.1 G4 Anas platyrhynchos High
Birds - Short term dietary (LC50/LD50) - - -
Fish - Acute 96 hour LC50 (mg l-1) 1.5 L3 Oncorhynchus mykiss Moderate
Fish - Chronic 21 day NOEC (mg l-1) - - -
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1) 0.0025 L3 Daphnia magna High
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1) - - -
Aquatic crustaceans - Acute 96 hour LC50 (mg l-1) 0.00011 F4 Americamysis bahia High
Sediment dwelling organisms - Acute 96 hour LC50 (mg l-1) 0.14 F3 Chironomus riparius, 1 day Moderate
Sediment dwelling organisms - Chronic 28 day NOEC, static, water (mg l-1) - - -
Sediment dwelling organisms - Chronic 28 day NOEC, sediment (mg kg-1) - - -
Aquatic plants - Acute 7 day EC50, biomass (mg l-1) - - -
Algae - Acute 72 hour EC50, growth (mg l-1) 0.5 L3 Scenedemus subspicatus Moderate
Algae - Chronic 96 hour NOEC, growth (mg l-1) - - -
Honeybees Contact acute 48 hour LD50 (μg bee-1) - - -
Oral acute 48 hour LD50 (μg bee-1) > 0.21 R4 High
Unknown mode acute 48 hour LD50 (μg bee-1) - - -
Earthworms - Acute 14 day LC50 (mg kg-1) > 267 L3 Eisenia foetida Moderate
Earthworms - Chronic 14 day NOEC, reproduction (mg kg-1) - - -
Other soil macro-organisms - e.g. Collembola LR50 / EC50 / NOEC / % Effect - - -
Other arthropod (1) LR50 g ha-1 - - -
% Effect Harmful AB1 Typhlodromus pyri Harmful
Other arthropod (2) LR50 g ha-1 - - -
% Effect - - -
Soil micro-organisms - - -
Mesocosm study data NOEAEC mg l-1 - - -
NOEAEC mg l-1 - - -


HUMAN HEALTH AND PROTECTION

for parathion

General:
Property Value Source/Quality Score/Other Information Interpretation
Mammals - Acute oral LD50 (mg kg-1) 2 G4 Rat High
Mammals - Dermal LD50 (mg kg-1 body weight) 71.0 L3 Rat -
Mammals - Inhalation LC50 (mg l-1) 0.03 L3 Rat (aerosol) -
Other Mammal toxicity endpoints - -
ADI - Acceptable Daily Intake (mg kg-1bw day-1) 0.004 JMPR 1995 -
ARfD - Acute Reference Dose (mg kg-1bw day-1) - - -
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1) - - -
Dermal penetration studies (%) - - -
Dangerous Substances Directive 76/464 List I; List II - -
Exposure Limits - - -
Exposure Routes Public -
Occupational -
Examples of European MRLs (mg kg-1) Value -
Note For the EU pesticides database click here
Drinking Water MAC (μg l-1) - - -

Health issues:
Carcinogen Mutagen Endocrine disrupter Reproduction / development effects Cholinesterase inhibitor Neurotoxicant Respiratory tract irritant Skin irritant Eye irritant

-

-

-

General human health issues Highly toxic
Possible brain toxicant

: Yes, known to cause a problem
: No, known not to cause a problem
: Possibly, status not identified
- : No data

Handling issues:
Property Value Source/Quality Score/Other Information Interpretation
General IMDG Transport Code is usually 6.1
CLP classification 2013 -
EC Risk Classification T+ - Very toxic: R26/28
T - Toxic: R24, R48/25
N - Dangerous for the environment: R50, R53
EC Safety Classification S1/2, S28, S36/37, S45, S60, S61
WHO Classification Ia - Extremely hazardous
US EPA Classification (formulation) I - Danger - Highly toxic
UN Number 3018
Waste disposal & packaging Packaging Group I (great danger)


TRANSLATIONS

for parathion

Language Name
English parathion
French parathion
German Parathion
Danish parathion
Italian paration
Spanish paratión
Greek parathion
Slovenian paration
Polish paration
Swedish -
Hungarian -
Dutch parathion

Record last updated: Saturday 17 August 2013
Contact: aeru@herts.ac.uk