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2025

Determination of the Mass Fraction of Water in Acetamiprid Technical Grade Substance

Reference standard: GB 29384-2012 Acetamiprid technical grade

[Scope]

This standard specifies the requirements for acephate technical grade, test methods, as well as labeling, packaging, storage, transportation, and acceptance criteria.

This standard applies to acetamiprid technical grade, which consists of acetamiprid itself and impurities generated during its production.

Note: Acetamiprid and its impurities, acetamide and methamidophos. O , O , S - For other names, structural formulas, and basic physicochemical parameters of trimethyl thiophosphate, see Appendix A.

【Requirement】

Appearance: White crystalline powder with no visible foreign impurities.

Technical indicators: The technical grade of acephate shall also meet the requirements specified in Table 1.

[Experimental Method]

Determination of Moisture Mass Fraction

Perform according to the "Karl Fischer method" in GB/T 1600.

GB/T 1600-2001 — Method for Determination of Moisture Content in Pesticides

Appendix A (Informative Appendix)

Acetamiprid and its impurities, acetamide and methamidophos. O , O , S - Other names, structural formulas, and basic physicochemical parameters of trimethyl thiophosphate

The other names, structural formula, and basic physicochemical parameters of the active ingredient acephate in this product are as follows:

ISO common name: acephate

CAS Registry Number: 30560-19-1

Chemical name: O , S -Dimethyl- N - Acetyl thiophosphoramidate

Structural formula:

Empirical formula: C ₄ H ₁₀ NO ₃ P.S.

Relative molecular mass: 183.2

Bioactivity: Insecticide

Melting point: 88°C~90°C

Vapor pressure (24°C): 0.226mPa

Relative density (20°C): 1.35

Solubility (20°C, g/L): 790 in water; 151 in acetone; >100 in ethanol; 35 in ethyl acetate; 16 in benzene; 0.1 in n-hexane

Stability: Stable under slightly acidic conditions, half-life DT ₅₀ (40°C) 60 h (pH = 9), 710 h (pH = 3).

The other names, structural formulas, and basic physicochemical parameters of the impurity acetamide in this product are as follows:

ISO common name: acetamide

CAS Registry Number: 60-35-5

Chemical name: Acetamide

Structural formula:

Empirical formula: C ₂ H ₅ NO

Relative molecular weight: 59.07

Melting point: 81°C

Boiling point: 222°C

Vapor pressure (65°C): 0.13kPa

Relative density (20°C): 1.16

Solubility: Soluble in water, ethanol, chloroform, pyridine, and glycerol; slightly soluble in diethyl ether; insoluble in n-octanol.

The other names, structural formula, and basic physicochemical parameters of the impurity methamidophos in this product are as follows:

ISO common name: methamidophos

CAS Registry Number: 10265-92-6

CIPAC digital code: 355

Chemical name: O , S -Dimethylamino thiophosphate

Structural formula:

Empirical formula: C ₂ H ₈ NO ₂ P.S.

Relative molecular mass: 141.1

Bioactivity: Insecticidal, acaricidal

Melting point: 44.9°C

Vapor pressure: 2.3 mPa (20°C), 4.7 mPa (25°C)

Relative density (20°C): 1.27

Solubility (20°C, g/L): In water >200, in isopropanol >200, in dichloromethane >200, in n-hexane 0.1–1, in toluene 2–5.

Stability: It is stable at room temperature but decomposes upon heating, so it has no boiling point. It is stable in the pH range of 3 to 8, with a half-life of DT. ₅₀ 1.8 years (pH 4), 120 hours (pH 7), 70 hours (pH 9).

Impurities in this product O , O , S - The other names, structural formulas, and basic physicochemical parameters of trimethyl thiophosphate are as follows:

Generic name: O , O , S -Trimethyl thiophosphate

CAS Registry Number: 15230-5

Chemical name: O , O , S -Trimethyl thiophosphate

Structural formula:

Empirical formula: C ₃ H ₉ O ₃ P.S.

Relative molecular mass: 156.15

[Recommended]

Karl Fischer Moisture Analyzer CA-310 Volumetric Method

Instrument features:

1. Higher detection accuracy: Under ideal conditions, it can detect trace amounts of moisture (absolute water content as low as 5 μg) with excellent repeatability.

2. The console can connect to up to 4 detection channels. Multiple channels provide better reference for experimental results and also enhance detection efficiency.

3. Standard Operating Procedure (S.O.P.) Recording: A standard operating procedure for testing a specific sample can be entered into the instrument. Subsequently, the instrument will automatically prompt the operator to perform the sample test according to the standard procedure.

Technical specifications:

Technical Specifications of the CA-310 Volumetric Micro Moisture Analyzer
Measurement method	Carl Fischer volumetric titration—4-channel simultaneous determination (optional)
Moisture determination range	0.1 ~ 999.999 mg H ₂ O
Display screen	8.4-inch color LCD touch screen, supports Chinese operation
File storage	Detailed experimental data storage: 9,999 entries Instrument timing start/stop setting options: 99 types
Printer	Optional thermal printer or impact printer.
Moisture vaporization device	Can be used with VA-300, VA-200, VA-210, VA-230, VA-236S, VA-121, and VA-122 gasification units all feature stepwise temperature control functionality.
Bromine detection mode Burette	Be equipped with Volume: 10 ml (2 ml, 5 ml, and 20 ml burettes available as optional accessories) Titration accuracy: 0.1% Reagent filling speed: 0.7 ml/1 sec
External Access I/O	Electronic balance: Automatic weight input 4 USB ports, 1 LAN port Import or export experimental data, backup/restore settings

Keywords:

Volatile impurities in ethanol

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