Chlorpyrifos
Chlorpyrifos
adalah racun serangga dari jenis organophosphate.
Pendedahan
Chlorpyrifos kepada manusia boleh berlaku melalui makanan, sedutan nafas
mahupun hanya dengan sentuhan kulit kepada tanah yang telah tercemar dengan
racun ini.
Chlorpyrifos
bersifat racun kepada saraf (Neurotoxin). Menurut USEPA, Chlorpyrifos boleh menyebabkan lelah dan mencacatkan bayi
dalam kandungan.
Chlorpyrifos
boleh menyebabkan sakit kepala, pandangan kabur, mata berair, air liur meleleh
dengan berlebihan, selsema, pening, keliru, lemah anggota badan, ketar, loya,
cirit birit, dan rentak jantung caca marba. Kesan jangka panjang Chlorpyrifos boleh
sebabkan lemah anggota badan, hilang selera makan dan rasa letih yang
keterlaluan.
Malangnya,
Chlorpyrifos ada digunakan bagi menyembur racun serangga ke atas permukaan buah
buahan. Mungkinkah buah seperti timun dll ada dicemari racun Chlorpyrifos?
Chlorpyrifos Facts
EPA
738-F-01-006
February 2002
February 2002
EPA has assessed the risks of chlorpyrifos and reached an
Interim Reregistration Eligibility Decision (IRED) for this organophosphate
(OP) pesticide. Provided that risk mitigation measures are adopted,
chlorpyrifos fits into its own "risk cup"-- its individual, aggregate
risks are within acceptable levels. Chlorpyrifos also is eligible for
reregistration, pending a full reassessment of the cumulative risk from all
OPs.
Used on a variety of food and feed crops, golf courses,
as a non-structural wood treatment, and as an adult mosquitocide, chlorpyrifos
residues in food and drinking water do not pose risk concerns. With mitigation
eliminating virtually all homeowner uses, chlorpyrifos fits into its own
"risk cup." With other mitigation measures, chlorpyrifos worker and ecological
risks also will be below levels of concern for reregistration.
EPA's next step under the Food Quality Protection Act
(FQPA) is to complete a cumulative risk assessment and risk management decision
encompassing all the OP pesticides, which share a common mechanism of toxicity.
The interim decision on chlorpyrifos cannot be considered final until this
cumulative assessment is complete. Further risk mitigation may be warranted at
that time.
EPA is reviewing the OP pesticides to determine whether
they meet current health and safety standards. Older OPs need decisions about
their eligibility for reregistration under FIFRA. OPs with residues in food,
drinking water, and other non-occupational exposures also must be reassessed to
make sure they meet the new FQPA safety standard.
The chlorpyrifos interim decision was made through the OP
pilot public participation process, which increases transparency and maximizes
stakeholder involvement in EPA's development of risk assessments and risk
management decisions. EPA worked extensively with affected parties to reach the
decisions presented in this interim decision document, which concludes the OP
pilot process for chlorpyrifos.
Uses
·
Chlorpyrifos
is an organophosphate insecticide, acaricide and miticide used to control
foliage and soil-borne insect pests on a variety of food and feed crops.
·
Approximately
10 million pounds are applied annually in agricultural settings. The largest
agricultural market for chlorpyrifos in terms of total pounds ai is corn (~5.5
million).
Health Effects
·
Chlorpyrifos
can cause cholinesterase inhibition in humans; that is, it can overstimulate
the nervous system causing nausea, dizziness, confusion, and at very high
exposures (e.g., accidents or major spills), respiratory paralysis and death.
Risks
·
Dietary
exposures from eating food crops treated with chlorpyrifos are below the level
of concern for the entire U.S. population, including infants and children.
Drinking water risk estimates based on screening models and monitoring data from
both ground and surface water for acute and chronic exposures are generally not
of concern.
·
In June,
2000, the Agency entered into an agreement with the technical registrants to
eliminate virtually all homeowner uses, except ant and roach baits in child
resistent packaging.
·
Residential
postapplication exposures may occur after termiticide use in residential
structures. To mitigate risks from this use, the technical registrants agreed
in June 2000 to limit termiticide treatments to 0.5% solution, and cancel all
postconstruction uses. Pre-construction use will remain until 2005, unless
acceptable exposure data are submitted that show that residential
postapplication risks from this use are not a concern.
·
Occupational
exposure to chlorpyrifos is of concern to the Agency. Exposures of concern
include mixing/loading liquids for aerial/chemigation and groundboom
application, mixing wettable powder for groundboom application, aerial
application, and application by backpack sprayer, high-pressure handwand, and hand-held
sprayer or duster. Generally, these risks can be mitigated by a combination of
additional personal protective equipment and engineering controls, and by
reductions in application rates. Additionally, the Agricultural Handler Task
Force will be developing exposure data to better characterize the risk from
certain uses (e.g., applying granulars by air).
·
Risk
quotients indicate that a single application of chlorpyrifos poses risks to
small mammals, birds, fish and aquatic invertebrate species for nearly all
registered outdoor uses. Multiple applications increase the risks to wildlife
and prolong exposures to toxic concentrations. To address these risks, a number
of measures including reduced application rates, increased retreatment
intervals, reduced seasonal maximum amounts applied per acre, and no-spray
setback zones around water bodies will be needed.
Risk Mitigation
In order to support a reregistration eligibility decision
for chlorpyrifos, the following risk mitigation measures are necessary:
·
To mitigate
risks to agricultural workers PPE consisting of double layers, chemical
resistant gloves, chemical resistant shoes plus socks, chemical resistant
headgear for overhead exposure, chemical resistant apron when cleaning and
mixing or loading and a dust/mist respirator are required for the following
scenarios: mixing/loading liquids for groundboom and airblast application,
loading granulars for ground application, tractor drawn granular spreader, and
low pressure handwand.
·
engineering
controls are required for the following scenarions: mixing wettable powder for
groundboom application (water soluble packaging), mixing wettable powder for
airblast application (water soluble packaging), and aerial application of
sprays (enclosed cockpit).
·
There are
still some occupational risk scenarios that are still below the target MOE of
100, even with all feasible PPE or engineering controls. The risk assessments
for these uses will be refined with additional data.
·
To
mitigate ecological risks the technical registrants have agreed to label
amendments which include the use of buffer zones to protect water quality, fish
and wildlife, reductions in application rates, number of applications per
season, seasonal maximum amounts applied, and increases in the minimum intervals
for retreatment.
·
The
mitigation measures prescribed in the IRED along with mitigation that is
already being implemented as a result of the June, 2000, Memorandum of
Agreement, will reduce risk to both terrestrial and aquatic species. For
example, many of the reported incidents of wildlife mortality associated with
chlorpyrifos use were related to residential lawn and termite uses and use on
golf courses. The residential uses have been eliminated, the termiticide use is
being phased out, and the application rate on golf courses has been reduced
from 4 to 1 lb/ai/A. Additionally, no-spray buffers around surface water
bodies, as well as rate reductions for agricultural uses will be implemented as
a result of this IRED and will further reduce the environmental burden of
chlorpyrifos.
The OP Pilot Public Participation Process
The organophosphates are a group of related pesticides that affect the functioning of the nervous system. They are among EPA's highest priority for review under the Food Quality Protection Act.
The organophosphates are a group of related pesticides that affect the functioning of the nervous system. They are among EPA's highest priority for review under the Food Quality Protection Act.
EPA is encouraging the public to participate in the
review of the OP pesticides. Through a six-phased pilot public participation
process, the Agency is releasing for review and comment its preliminary and
revised scientific risk assessments for individual OPs. (Please contact the OP
Docket, telephone 703-305-5805, or see EPA's web site, Pesticide
Reregistration Status.)
EPA is exchanging information with stakeholders and the
public about the OPs, their uses, and risks through Technical Briefings,
stakeholder meetings, and other fora. USDA is coordinating input from growers
and other OP pesticide users.
Based on current information from interested stakeholders
and the public, EPA is making interim risk management decisions for individual
OP pesticides, and will make final decisions through a cumulative OP
assessment.
Next Steps
·
Numerous
opportunities for public comment were offered as this decision was being
developed. In addition, the chlorpyrifos IRED has been issued with a public
comment period (see Pesticide
Reregistration Status).
·
When the
cumulative risk assessment for all organophosphate pesticides is completed, EPA
will issue its final tolerance reassessment decision for chlorpyrifos and may
request further risk mitigation measures. The Agency will revoke the tomato
tolerance and amend the grape and apple tolerances for chlorpyrifos. For all
OPs, raising and/or establishing tolerances will be considered once a
cumulative assessment is completed.
http://www.pesticideinfo.org/Detail_Chemical.jsp?Rec_Id=PC33392
Chlorpyrifos is a Organophosphorus compound. |
Report a Poisoning |
Symptoms of Poisoning with Organophosphorus Compounds |
|
- Excessive salivation, sweating, rhinorrhea and tearing. - Muscle twitching, weakness, tremor, incoordination. - Headache, dizziness, nausea, vomiting, abdominal cramps, diarrhea. - Respiratory depression, tightness in chest, wheezing, productive cough, fluid in lungs. - Pin-point pupils, sometimes with blurred or dark vision. - Severe cases: seizures, incontinence, respiratory depression, loss of consciousness. - Cholinesterase inhibition. |
NOTE! STRICT HYGIENE! AVOID EXPOSURE OF ADOLESCENTS AND CHILDREN! |
General First Aid:
IN ALL CASES CONSULT A DOCTOR!
|
|
Route of Exposure |
Symptoms |
First Aid |
Inhalation
|
Convulsions.
Dizziness. Sweating. Nausea. Unconsciousness. Vomiting. Pupillary
constriction muscle cramp excessive salivation.
|
Fresh air rest.
Artificial respiration if indicated. Refer for medical attention.
|
Skin
|
MAY BE ABSORBED!
(Further see Inhalation).
|
Remove contaminated
clothes. Rinse and then wash skin with water and soap. Refer for medical
attention.
|
Eyes
|
Blurred vision.
|
First rinse with
plenty of water for several minutes (remove contact lenses if easily
possible) then take to a doctor.
|
Ingestion
|
Abdominal cramps.
Diarrhoea. Nausea. Unconsciousness. Vomiting. (See Inhalation).
|
Induce vomiting
(ONLY IN CONSCIOUS PERSONS!). Rest. Refer for medical attention.
|
Notes for ICSC
Information
|
||
Depending on the
degree of exposure periodic medical examination is indicated. Specific
treatment is necessary in case of poisoning with this substance; the
appropriate means with instructions must be available. If the substance is formulated
with solvent(s) also consult the card(s) (ICSC) of the solvent(s). Carrier
solvents used in commercial formulations may change physical and
toxicological properties. Do NOT take working clothes home. Dursban Dowco 179
Eradex Lorsban Pyrinex Coroban Danusban Terial are trade names.
|
Aquatic Ecotoxicity |
All Toxic Effects for Organism Group |
|
Accumulation,
Avoidance, Behavior, Biochemistry, Development, Enzyme(s), Genetics, Growth,
Morphology, Mortality
|
|
Genetics,
Intoxication, Mortality, Population
|
|
Accumulation,
Biochemistry, Ecosystem Process, Physiology, Population
|
|
Mortality,
Population
|
|
Accumulation,
Behavior, Biochemistry, Enzyme(s), Feeding Behavior, Genetics, Growth,
Intoxication, Mortality, No Effect Coded, Physiology, Population
|
|
Development,
Population
|
|
Accumulation,
Avoidance, Behavior, Biochemistry, Cell(s), Development, Enzyme(s), Feeding
Behavior, Genetics, Growth, Histology, Injury, Intoxication, Morphology,
Mortality, Physiology, Population, Reproduction
|
|
Accumulation,
Behavior, Biochemistry, Development, Enzyme(s), Genetics, Growth,
Intoxication, Mortality, No Effect Coded, Physiology, Population,
Reproduction
|
|
Development,
Mortality, Population
|
|
Accumulation,
Behavior, Development, Enzyme(s), Growth, Intoxication, Morphology,
Mortality, Population, Reproduction
|
|
Behavior,
Immunological, Mortality, Population, Reproduction
|
|
Accumulation,
Biochemistry, Cell(s), Ecosystem Process, Enzyme(s), Growth, Mortality,
Physiology, Population
|
|
Accumulation,
Avoidance, Behavior, Biochemistry, Cell(s), Development, Enzyme(s), Feeding
Behavior, Growth, Hormone(s), Intoxication, Mortality, No Effect Coded,
Population, Reproduction
|
|
Accumulation,
Behavior, Biochemistry, Cell(s), Development, Enzyme(s), Feeding Behavior,
Genetics, Growth, Immunological, Mortality, Physiology, Population,
Reproduction
|
Summary of Acute Toxicity for Organism Group |
||
Moderately Toxic
|
Moderate to Very
High Toxicity
|
|
Very Highly Toxic
|
Very Highly Toxic
|
|
Very Highly Toxic
|
High to Very High
Toxicity
|
|
Highly Toxic
|
Moderate to Very
High Toxicity
|
|
Very Highly Toxic
|
Moderate to Very
High Toxicity
|
|
Very Highly Toxic
|
Very Highly Toxic
|
|
Moderately Toxic
|
Moderate to High
Toxicity
|
|
Moderately Toxic
|
Moderate to Very
High Toxicity
|
|
Moderately Toxic
|
Moderate Toxicity
|
|
Moderately Toxic
|
Slight to Very High
Toxicity
|
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