LY/T 3156-2019Activated carbon for air purification in car (English PDF)

4.1 Ash

Determined according to GB/T 12496.3.

4.2 Moisture

Determine according to GB/T 12496.4.

4.3 Iodine adsorption value

Determined according to GB/T 12496.8.

4.4 Adsorption value

4.4.1 Method summary

Under the specified test conditions, place the sample in an adsorber filled with adsorbent vapor, and adsorb it at a constant temperature of (25 ± 1) °C for 24 h.

The adsorption value of the product is expressed in milligrams per gram of activated carbon (mg/g). The adsorbents are mainly benzene, toluene, xylene, ethylbenzene, Styrene, formaldehyde, acetaldehyde.

4.4.2 Reagents

Benzene (GB/T 690), analytical grade; toluene (GB/T 684), analytical grade; xylene (GB/T 16494), analytical grade; ethylbenzene, Analytical pure; styrene, analytically pure; formaldehyde (GB/T 685), analytically pure, formaldehyde content 37.0-40.0%; acetaldehyde, analytically pure.

4.4.3 Instrument

4.4.3.1 Adsorption apparatus. It is made of colorless glass, and its appearance requires no bubbles and other obvious defects. There should be no obvious fusion at the glass weld Stacking and wrinkling, the adsorption instrument is connected to the grinding mouth.

The whole adsorption apparatus is a closed container, see Figure 1.

1. Adsorbent front view; 2. Top cover front view; 3. Grill top view

Figure 1 Adsorption apparatus

4.4.3.2 Incubator, temperature range 0 ~ 150 °C, accuracy ± 0.5 °C.

4.4.3.3 Tall weighing bottle, 25 mm × 40 mm.

4.4.3.4 Analytical balance with a sensitivity of 0.1 mg.

6.1 Calculation formula

The adsorption rate is calculated by the following formula (1).

twenty one

In the formula.

X-adsorption rate, mg/g;

m1-mass of sample and weighing bottle before adsorption, g;

m2-mass of 24 h sample and weighing bottle, g;

m3-weighing bottle mass, g;

6.2 Representation of results

The adsorption value is the arithmetic mean of two parallel tests.

6.3 Allowable error

The absolute difference between two parallel test results of the adsorption value must not exceed 5%.

7.1 Batch unit

The mass of each batch does not exceed 1 kg.

7.2 Sampling rules

7.2.1 Number of samples per batch. implemented according to GB/T 6678. The rules for selecting the number of sampling units are shown in Table 2.

7.2.2 Sample size. The sample size of each batch is not less than 100 g.

Mix the extracted samples thoroughly, shrink the sample by quartering method, select 100 g and put them into two clean and dry glasses with grinding plugs in the bottle, a label is attached on the bottle, indicating the manufacturer's name, product model, grade, batch number, sampling date, one bottle for inspection, and one bottle for storage for inspection.

Table 2 Number of sampling units

The minimum number of units for the unit of the overall material 1 ~ 10 11 ~ 49 50 ~ 64 65 ~ 81 82 ~ 101 102 ~ 125 126 ~ 151 152 ~ 181 182 ~ 216 217 ~ 254 255 ~ 296 297 ~ 343 344 ~ 394 395 ~ 450 451 ~ 512 all units

7.2.3 The sampler shall be clean and rust-free, and inserted three-quarters of its depth along the diagonal of the package.

7.3 Decision rules

There is an unqualified index requirement in the test results. The sample should be re-selected from the double volume package for inspection.

If the product is qualified, the products in this batch are judged as non-conforming products.

7.4 Expression of judgment results

According to the test results, the quality indicators in Table 1 are compared to determine whether the sample is a qualified product. The result is expressed as follows.

In the case of unopened use, it is a qualified/non-qualified product.