Carbaryl Solution: Properties, Uses & Lab Handling Guide

Carbaryl solution is a precisely formulated liquid preparation of 1-naphthyl methylcarbamate, a broad-spectrum N-methylcarbamate insecticide widely employed as an analytical reference standard and research reagent in pesticide residue analysis, toxicology studies, and environmental monitoring.

Chemical Name

1-Naphthyl methylcarbamate (Carbaryl)

CAS Number

63-25-2

Chemical Class

N-Methylcarbamate insecticide

Mechanism of Action

Reversible acetylcholinesterase (AChE) inhibitor

Primary Research Use

Analytical reference standard for pesticide residue analysis and environmental monitoring

SKU

C109841

Physical Form

Solution (solvent and concentration to be confirmed per certificate of analysis)

Chemical Identity and Physical Properties

Carbaryl (IUPAC name: naphthalen-1-yl methylcarbamate; CAS 63-25-2) is the active pharmaceutical ingredient in the widely studied N-methylcarbamate class of pesticides. Its molecular formula is C₁₂H₁₁NO₂ with a molecular weight of approximately 201.22 g/mol. The pure solid form presents as a white to off-white crystalline powder with a melting point of approximately 142 °C.

In solution form, carbaryl is dissolved in an appropriate organic solvent—commonly acetonitrile, methanol, or acetone—at a defined and certified concentration, enabling direct use in chromatographic and spectroscopic workflows without the need for further weighing or dissolution steps. The compound exhibits moderate water solubility (~120 mg/L at 20 °C) and is more readily soluble in polar organic solvents. Carbaryl is susceptible to hydrolysis under alkaline conditions, which must be considered during sample preparation and storage.

Laboratory Applications and Research Uses

Carbaryl solution is most commonly employed in analytical chemistry and environmental science laboratories as a certified or in-house reference standard. Key applications include:

• Pesticide Residue Analysis: Carbaryl solution is used to prepare calibration curves and spike recovery experiments in food safety testing, soil analysis, and water quality monitoring, typically by high-performance liquid chromatography (HPLC) or gas chromatography–mass spectrometry (GC-MS).
• Toxicology and Pharmacology Research: As a reversible inhibitor of acetylcholinesterase, carbaryl is used to study cholinergic signaling, neurotoxicity mechanisms, and to evaluate the efficacy of antidotes or protective agents in in vitro and in vivo models.
• Environmental Monitoring: Carbaryl is a regulated pesticide in many jurisdictions; solution standards are therefore essential for compliance testing of drinking water, surface water, and agricultural runoff.
• Method Development and Validation: Laboratories developing new multi-residue analytical methods use carbaryl solution to assess method sensitivity, selectivity, linearity, and matrix effects.

The ready-to-use solution format minimizes preparation errors and improves inter-laboratory reproducibility compared to weighing the neat solid.

Safety, Handling, and Regulatory Considerations

Carbaryl is classified as a moderately hazardous substance (WHO Class II) and is listed as a possible human carcinogen by IARC (Group 2B). All work with carbaryl solution must be conducted under appropriate risk assessment protocols.

Personal Protective Equipment (PPE): Wear chemical-resistant gloves (e.g., nitrile), a laboratory coat, and safety glasses as a minimum. Where aerosol generation is possible, use a certified fume hood and consider respiratory protection.

Exposure Routes: Carbaryl can be absorbed dermally, by inhalation, and orally. Dermal absorption is of particular concern when handling solutions. In case of skin contact, remove contaminated clothing immediately and wash with soap and water. Seek medical attention if symptoms of cholinesterase inhibition appear (e.g., excessive salivation, miosis, nausea).

Waste Disposal: Carbaryl-containing waste must be disposed of in accordance with local, national, and institutional regulations governing hazardous chemical waste. Do not pour down the drain.

Regulatory Status: The use of carbaryl as a pesticide is banned or restricted in several countries including the European Union. Researchers should verify current regulatory status in their jurisdiction before purchasing or using this compound.

Storage Conditions and Stability

Proper storage of carbaryl solution is essential to maintain concentration accuracy and analytical reliability over time.

• Temperature: Store at 2–8 °C (refrigerator) in a tightly sealed container, protected from light. Avoid freezing unless the specific solvent system permits it and the certificate of analysis recommends it.
• Light Sensitivity: Carbaryl undergoes photodegradation; amber glass vials or opaque secondary packaging should be used at all times.
• Hydrolytic Stability: Alkaline conditions accelerate hydrolysis; solutions should be kept in slightly acidic to neutral solvents and never mixed with basic matrices.
• Container Integrity: Ensure caps are tightly closed between uses to prevent solvent evaporation, which would alter the effective concentration of the solution.
• Shelf Life: Always refer to the expiry date and certificate of analysis supplied with each lot. Do not use beyond the stated expiry date for quantitative analytical work.

For long-term archival of reference standards, consider preparing aliquots in amber vials under inert atmosphere to minimize oxidative and photolytic degradation.

Quality and Traceability for Analytical Use

For regulated analytical applications—such as food safety testing, environmental compliance monitoring, and method validation—the traceability and documentation of reference standards are as important as their chemical purity.

When selecting a carbaryl solution for quantitative work, consider the following quality attributes:

• Purity and Certification: Confirm the stated purity and the analytical method used to determine it (e.g., HPLC-UV, GC-FID). Certified Reference Materials (CRMs) traceable to national metrology institutes offer the highest confidence.
• Certificate of Analysis (CoA): Each lot should be accompanied by a CoA specifying the exact concentration, solvent identity, purity, preparation date, expiry date, and analytical data.
• Lot-to-Lot Consistency: For longitudinal studies or multi-site projects, document lot numbers to ensure traceability and to investigate any unexpected results.
• Solvent Compatibility: Confirm the solvent used in the solution is compatible with your downstream analytical system (e.g., mobile phase, injection solvent).

Aladdin Scientific's Carbaryl solution (SKU: C109841) is intended to support high-integrity research and analytical workflows. Consult the product's CoA for specific lot data before use.

Frequently asked questions

What solvent and concentration is the Aladdin carbaryl solution (C109841) supplied in?

The exact solvent system and concentration are specified on the Certificate of Analysis (CoA) provided with each individual lot. Please download the lot-specific CoA from the product page or contact Aladdin Scientific technical support for confirmation before use.

Is carbaryl solution suitable for use as an HPLC or GC-MS reference standard?

Yes, carbaryl solution is widely used in HPLC and GC-MS workflows for pesticide residue analysis and method validation. Ensure the solvent used in the solution is compatible with your mobile phase or injection conditions, and verify purity and concentration from the CoA before preparing calibration standards.

What are the key safety precautions when working with carbaryl solution in the laboratory?

Work in a fume hood, wear nitrile gloves, a lab coat, and safety glasses. Carbaryl is absorbed through the skin and inhibits acetylcholinesterase; in case of skin contact, wash immediately with soap and water and seek medical attention if symptoms such as nausea, miosis, or excessive salivation develop. Dispose of waste according to local hazardous chemical regulations.

How should carbaryl solution be stored to maintain its stability?

Store carbaryl solution at 2–8 °C in a tightly sealed, amber glass vial protected from light. Avoid alkaline conditions and excessive heat, as carbaryl undergoes hydrolysis under alkaline pH and photodegradation under UV light. Always observe the expiry date stated on the CoA.

Is carbaryl regulated or banned in certain regions, and does this affect purchasing?

Carbaryl's use as a pesticide is banned or restricted in the European Union and several other jurisdictions, though it may be purchased for legitimate laboratory research and analytical purposes subject to local regulations. Buyers are responsible for verifying compliance with all applicable laws in their country or region before ordering.

References

1. International Agency for Research on Cancer (IARC). Carbaryl. IARC Monographs on the Evaluation of Carcinogenic Risks to Humans.
2. World Health Organization (WHO). The WHO Recommended Classification of Pesticides by Hazard. Geneva: WHO.
3. Tomlin C (ed.). The Pesticide Manual: A World Compendium. British Crop Production Council. (Entry: Carbaryl, CAS 63-25-2)
4. European Food Safety Authority (EFSA). Peer review of the pesticide risk assessment of the active substance carbaryl. EFSA Journal.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.