silica ** silox ** constituent of diatomaceous earth ** amorphous silica ** crystalline silica ** Translations

Environmental Fate - Ecotoxicology - Human Health

GENERAL INFORMATION

Description: Inert mineral used as a carrier in some pesticide products and sometimes used as an insecticide for the control of ticks, mites and other insects

Introduction: -

EC Directive 1107/2009 (repealing 91/414):

Status	None - not a ppp
Dossier rapporteur/co-rapporteur	Not applicable
Date inclusion expires	Not applicable

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

Also registered in: Most countries

General status:

Pesticide type	Insecticide, Acaricide, Other product constituent
Other Constituent Type	Carrier
Substance group	Metal oxide
Substance origin	Synthetic
Mode of action	Inert but acts as an insecticide via its abrasive and desiccant physical properties
CAS RN	7631-86-9
EC number	231-545-4
CIPAC number	None allocated
US EPA chemical code	072605
Chemical formula	SiO2
SMILES	O=[Si]=O
International Chemical Identifier (InChI)	InChI=1/O2Si/c1-3-2
Structure diagram/image available?	Yes
Molecular mass (g mol-1)	60.08
IUPAC Name	dioxosilane
CAS Name	silicon dioxide
Other status information	-
Herbicide Resistance Classification (HRAC)	Not applicable
Insecticide Resistance Classification (IRAC)	Not applicable
Fungicide Resistance Classification (FRAC)	Not applicable
Physical state	White powder
Related substances & organisms	kieselgur

Formulations:

Property	Value
Example manufacturers of products using this active	-
Example products using this active	Cab-O-Sil Aerodisp
UK LERAP status	Not applicable
Formulation and application details	A free flowing additive to powders, granules etc.

ENVIRONMENTAL FATE

Property		Value	Source/Quality Score/Other Information	Interpretation
Solubility - In water at 20oC (mg l-1)		120	Q3	Moderate
Solubility - In organic solvents at 20oC (mg l-1)		-	-	-
Melting Point (oC)		1610	A5	-
Boiling Point (oC)		-	-	-
Degradation point (oC)		-	-	-
Flashpoint (oC)		-	-	-
Octanol-water partition coefficient at pH 7, 20oC	P	-	-	-
	Log P	-	-	-
Bulk density (g ml-1)/Specific gravity		2.2	Q3	-
Dissociation constant (pKa) at 25oC		-	-	-
		Note:
Vapour pressure at 25oC (mPa)		1350000	A5	Intermediate state
Henry's law constant at 25oC (Pa m3 mol-1)		-	-	-
Henry's law constant at 20oC (dimensionless)		2.78 X 10-01	Calculated	Volatile
GUS leaching potential index		-	-	-
SCI-GROW groundwater index (µg l-1) for a 1 kg ha-1 or 1 l ha-1 application rate	Value	-	-	-
	Note	-
Potential for particle bound transport index		-	Calculated	Low
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)	Stable	Q3	Very persistent
	DT50 (lab at 20oC)	-	-	-
	DT50 (field)	-	-	-
	DT90 (lab at 20oC)	-	-	-
	DT90 (field)	-	-	-
	Note:	-
Aqueous photolysis DT50 (days) at pH 7	Value	Stable	Q3	Stable
	Note	-
Aqueous hydrolysis DT50 (days) at 20oC and pH 7	Value	Stable	Q3	Very persistent
	Note	-
Water-Sediment DT50 (days)		Stable	Q3	Stable
Water phase only DT50 (days)		Stablle	Q3	Stable

Soil adsorption and mobility:

Property		Value	Source/Quality Score/Other Information	Interpretation
Linear	Kd	-	-	-
	Koc	-
	Notes and range	-
Freundlich	Kf	-	-	-
	Kfoc	-
	1/n	-
	Notes and range	-
pH sensitivity		-

ECOTOXICOLOGY

Property		Value	Source/Quality Score/Other Information	Interpretation
Bio-concentration factor	BCF	-	-	-
	CT50 (days)	-		-
Bioaccumulation potential		-	-	-
Mammals - Acute oral LD50 (mg kg-1)		5110	R3 Rat	Low
Mammals - Short term dietary NOEL	(mg kg-1)	-	-	-
	(ppm diet)	-		-
Birds - Acute LD50 (mg kg-1)		-	-	-
Birds - Short term dietary (LC50/LD50)		-	-	-
Fish - Acute 96 hour LC50 (mg l-1)		10000	Q3 Danio rerio	Low
Fish - Chronic 21 day NOEC (mg l-1)		-	-	-
Aquatic invertebrates - Acute 48 hour EC50 (mg l-1)		1000	Q3 Daphnia magna	Low
Aquatic invertebrates - Chronic 21 day NOEC (mg l-1)		-	-	-
Aquatic crustaceans - Acute 96 hour LC50 (mg l-1)		-	-	-
Sediment dwelling organisms - Acute 96 hour LC50 (mg l-1)		-	-	-
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)		440	Q3 Pseudokirchneriella subcapitata	Low
Algae - Chronic 96 hour NOEC, growth (mg l-1)		-	-	-
Honeybees - Acute 48 hour LD50 (µg bee-1)		-	-	-
Earthworms - Acute 14 day LC50 (mg kg-1)		-	-	-
Earthworms - Chronic 14 day NOEC, reproduction (mg kg-1)		-	-	-
Other soil macro-organisms - e.g. Collembola	LR50product ha EC50product ha NOECproduct ha % Effect	-	-	-
Other arthropod (1)	LR50 g ha-1	-	-	-
	% Effect	-	-	-
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

General:

Property		Value	Source/Quality Score/Other Information	Interpretation
Mammals - Acute oral LD50 (mg kg-1)		5110	R3 Rat	Low
Mammals - Dermal LD50 (mg kg-1 body weight)		> 5000	R3 Rabbit	-
Mammals - Inhalation LC50 (mg l-1)		2.2	A4	-
Other Mammal toxicity endpoints		-		-
ADI - Acceptable Daily Intake (mg kg-1bw day-1)		None allocated	A5	-
ARfD - Acute Reference Dose (mg kg-1bw day-1)		None allocated	A5	-
AOEL - Acceptable Operator Exposure Level - Systemic (mg kg-1bw day-1)		0.3	A5 as mg/m3 (inhalation)	-
Dermal penetration studies (%)		-	-	-
Dangerous Substances Directive 76/464		-	-	-
Exposure Limits		[MEL TWA 8hr (UK) 0.3 mg/m3]	B3 HSE	-
Exposure Routes	Public	[Public may become exposed via their diets but substance is relatively benign by this route]
	Occupational	[Serious risk to operators and other workers - PPE/PPC required]
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	Acetyl cholinesterase inhibitor	Neurotoxicant	Respiratory tract irritant	Skin irritant	Eye irritant
	-
General human health issues		[Dust can cause silicosis and bronchitis], [May cause sensitization via inhalation]

: 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		[Prevent generation of dust]
EC Risk Classification		[Carcinogen category 2: R49], [Xi - Irritant: R42, R43]
EC Safety Classification		S22, S36, S37, S45, S53
WHO Classification		NL	-	Not listed
US EPA Classification (formulation)		III	-	Caution - Slightly toxic
UN Number		-
Waste disposal & packaging		-

TRANSLATIONS