GB/T 27947-2020Hygienic requirements for phenol disinfectant (English PDF)

4.7 Water for production

Water for production shall meet the requirements for water for production in Hygienic specifications for disinfection product manufacturers (2009).

4.8 Other raw and auxiliary materials

Other raw and auxiliary materials shall meet the corresponding sanitary standards, specifications and other relevant regulations. They shall have corresponding conforming certification materials.

5.1 Active ingredient content

The active ingredient content shall meet the requirements of the label value.

5.2 pH value

The pH value shall meet the requirements of product enterprise standards or quality standards.

5.4 Indicators of killing microorganisms

5.4.1 Microbial killing effect in laboratory

Select the corresponding microorganism according to the product disinfection object. According to the use concentration and action time specified in corresponding GB 27950, GB 27951, GB 27952, GB 27954, specifications and product instructions, the killing effect of microorganisms shall meet the requirements of Table 1.

7.1 General rules

Use according to the methods for use that are marked on the product label, the instruction manual.

7.2 Disinfectant containing phenol and cresol

After disinfecting and wiping the object surface and fabric, the action time shall not exceed 15min. The soaking and disinfection time shall not exceed 30min.

7.3 Disinfectant containing p-chloro-m-xylenol

7.3.1 Hygienic hand disinfection: smear or wipe disinfection; the action time shall not exceed 1min.

7.3.2 Skin disinfection: wipe disinfection; the action time shall not exceed 5min.

7.3.3 Object surface disinfection: the action time after wiping shall not exceed 15min; the soaking and disinfection time shall not exceed 30min.

7.3.4 Mucosal disinfection: wipe or rinse disinfection; the action time shall not exceed 5min.

7.4 Disinfectant containing triclosan

7.4.1 Hygienic hand disinfection: smear or wipe disinfection; the action time shall not exceed 1min.

7.4.2 Surgical hand disinfection: smear or wipe disinfection; the action time shall not exceed 5min.

7.4.3 Skin disinfection: smear or wipe disinfection; the action time shall not exceed 5min.

7.4.4 Mucosal disinfection: wipe or rinse disinfection; the action time shall not exceed 5min.

7.4.5 Object surface disinfection: after wiping or spraying, the action time shall not exceed 15min; soaking disinfection time shall not exceed 30min.

A.1 Principle

Use volumetric analysis method. KBrO3 and KBr produce Br2 in acid medium.

Br2 has a substitution reaction with phenol to generate stable tribromophenol.

The remaining Br2 reacts with KI to produce I2. It can be Na2S2O3 standard titrant. According to the difference between Na2S2O3 standard titrant consumed by the blank (purified water instead of the sample) and Na2S2O3 standard titrant consumed by the sample, calculate the content of phenol in disinfectant.

A.2 Methods

A.2.1 Preparation and calibration of sodium thiosulfate standard titration solution (0.1mol/L)

A.2.1.1 Preparation

Weigh 26g of sodium thiosulfate pentahydrate (or 16g of anhydrous sodium thiosulfate). Add 0.20g of anhydrous sodium carbonate. Dissolve in 1000mL of water. Slowly boil it to boil 10min. Cool it.

After 2 weeks of placement, use #4 glass colander to filter.

A.2.1.2 Calibration

Weigh 0.18g of working reference reagent potassium dichromate that has been dried at 120°C±2°C to a constant amount. Put in an iodine measuring bottle.

Dissolve in 25mL of water. Add 2g of potassium iodide and 20mL of sulfuric acid solution (20%). Shake them well. Place in a dark place for 10min. Add 150mL of water (15°C~20°C). Use the prepared sodium thiosulfate solution to titrate.

Add 2mL of starch indicator solution (10g/L) when it approaches to the end point.

Continue to titrate until the solution turns from blue to bright green. Do a blank test at the same time.

Calculate the concentration of sodium thiosulfate standard titrant according to formula (A.1): […]

B.1 Principle

Use chromatographic column to separate. Use hydrogen flame ionization detector to detect. Determine the nature according to the retention time. Quantify according to peak height or peak area.

B.2 Chromatographic reference conditions and system suitability test

Use 2% phosphoric acid-containing glycol polyester adipate as the stationary phase. Coating concentration is 4%~10%. Use hydrogen flame detector.

Column temperature is 145°C. The temperature of the inlet and detector is 200°C.

B.3 Determination of calibration factor

Accurately weigh 1.3g of salicylaldehyde. Put in a 50mL volumetric flask. Add ether to dissolve and dilute to the scale. Shake well and use it as the internal standard solution. Accurately weighed 0.65g of ortho-cresol reference substance. Put in a 25mL volumetric flask. Add ether to dissolve and dilute to the scale. Shake well and use it as the reference solution. Precisely measure 5 mL of the reference solution and the internal standard solution respectively. Put in a plugged test tube. Seal and plug. Shake well. Take 1µL into the gas chromatograph. Calculate the correction factor for ortho-cresol. Multiply by 1.042. It shall be the correction factor for meta-cresol.

B.4 Sample determination

Precisely weigh 1.0g of this product and place it in a separating funnel. Add 0.1 mL of concentrated hydrochloric acid. Shake well. Add 3mL of water. Shake well. Precisely add 20mL of ether. Shake gently. Place still for stratification.

Discard the water layer. Add 5mLof water. Shake gently. Conduct stratification.

Discard the water layer. Precisely measure 5mL of ether extract and 5mL of internal standard solution in a plugged test tube. Shake well. Take 1µL into the gas chromatograph. Determine.

B.5 Calculation formulas

B.5.1 Calculation of o-cresol correction factor

C.1 Principle

P-Chloride m-xylenol has UV absorption at 280nm wavelength. It may use reversed-phase high performance liquid chromatography (HPLC) to separate.

Determine the nature according to the retention time. Quantify based on the peak area. This method is suitable for determining the active content of p-chloro-m-xylenol in disinfectant.

C.2 Preparation of reagents

Methanol (chromatographically pure). Standard solution of p-chloro-m-xylenol: weigh 0.1g of standard p-chloro-m-xylenol; use a small amount of methanol to dissolve and dilute to 100mL; this solution contains 1g of p-chloro-m-xylenol per 1L.

C.3 Chromatographic reference conditions

Chromatographic column: C18 column (150mm×4.6mm, inner diameter is 5µm).

Mobile phase: methanol/water (70/30); before analysis, filter through 0.45µm membrane and vacuum degas. Flow rate: 1.00mL/min. UV detection wavelength: 220nm. Column temperature: 25°C.

C.4 Drawing of standard curve

Use standard solution of p-chloro-m-xylenol to prepare the series solutions of which the mass concentration is respectively 0mg/L, 200 mg/L, 400 mg/L, 600 mg/L and 800mg/L. Under the set chromatographic conditions, take 5µL respectively for analysis. Take the standard series mass concentration as the abscissa X and the peak area as the ordinate Y to perform linear regression processing, so as to obtain the linear equation.

C.5 Sample determination

If the labeled concentration of p-chloro-m-xylenol in the disinfectant is too high, it needs to be properly diluted. Make the concentration after dilution within the linear range of the standard curve. For paste samples, it shall use the mobile phase to prepare an aqueous solution. Filter by 0.45µm membrane for use.

Under the set chromatographic conditions, inject 5µL of sample solution for analysis. According to the peak area, calculate the corresponding p-chloro-m- Annex D (normative) Determination of 2,4,4'-trichloro-2'-hydroxydiphenyl ether in disinfectant

D.1 Principle

2,4,4'-Trichloro-2'-hydroxydiphenyl ether has UV absorption at 280nm. It may use reversed-phase high performance liquid chromatography (HPLC) to separate. Determine the nature according to the retention time. Quantify based on the peak area.

D.2 Preparation of reagents

Methanol (chromatographically pure). 2,4,4'-Trichloro-2'-hydroxydiphenyl ether standard solution: weigh 0.1g of 2,4,4'-trichloro-2'-hydroxydiphenyl ether standard product; use a small amount of methanol to dissolve; set constant volume to 100mL; this solution contains 1g of 2,4,4'-trichloro-2'- hydroxydiphenyl ether per 1L.

D.3 Chromatographic reference conditions

The chromatographic reference conditions are as follows:

a) Chromatographic column: C18 column (150mm×4.6mm, inner diameter is 5µm);

b) Mobile phase: methanol/water (80/20); before analysis, filter through 0.45µm membrane and vacuum degas;

c) Flow rate: 1.5mL/min;

d) UV detection wavelength: 280nm;

e) Column temperature: 25°C.

D.4 Drawing of standard curve

Use 2,4,4'-Trichloro-2'-hydroxydiphenyl ether standard solution to prepare the series solutions of which the mass concentration is respectively 0 mg/L, 200 mg/L, 400 mg/L, 600mg/L and 800mg/L. Under the set chromatographic conditions, take 5µL respectively for analysis.

Take the standard series mass concentration as the abscissa X and the peak area as the ordinate Y to perform linear regression processing, so as to obtain […]