DA/T 81-2019Technical specifications for monitoring of archival repository air quality (English PDF)

4.1 Distribution principle

The number of sampling points is determined according to the size of the archive warehouse to be tested and the site conditions, and the measured value should truly reflect the library the air quality of the room. In principle, each relatively independent warehouse should have 1~3 points; when the area exceeds 100m2, sampling points should be appropriately increased.

4.2 Distribution method

When multi-point sampling, the points should be distributed evenly according to the diagonal or quincunx pattern, and the vents should be avoided, the distance from the wall should be greater than 0.5m, and the distance from the doors and windows should be greater than 1.0m. The height of the sampling point is generally 1.0m~1.5m above the ground. Those with special requirements can be determined according to specific circumstances.

4.3 Sampling time and frequency

Newly built or renovated archive warehouses should be tested before they are officially used, and should meet the requirements of GB 50325 for Class II public construction projects.

Claim. The sampling time and frequency of daily testing should be determined according to the testing purpose, the concentration level of the analyte and the detection limit of the testing analysis method.

The archive warehouse in use is recommended to be sampled and tested at least once a year.

4.4 Closing time

The test should be carried out 12h after the external doors and windows are closed. For warehouse environments that use centralized air conditioning systems or fresh air systems, the equipment should be Often runs. Special requirements can be determined according to site conditions and requirements.

4.5 Sampling method

4.5.1 Instantaneous sampling

Under the conditions of meeting the sampling requirements of the pollutants to be tested, environmental samples are quickly collected, and the detection value represents the air in the archive warehouse at a certain point in time Quality parameters. If multiple sampling is required, the general sampling interval is 10min~15min, and at least 3 samples should be collected at each point.

The sampling volume is roughly the same each time.

4.5.2 Continuous sampling

Under the conditions that meet the sampling requirements of the pollutants to be tested, use a powered air extraction device to continuously collect the ring to be tested for a predetermined period of time.

For environmental samples, the detection value represents the average value of air quality parameters in the archive warehouse during the period.

4.6 Sampling records

When sampling, the site conditions, sampling date, time, location, quantity, arrangement method, atmospheric pressure, temperature, relative humidity, wind speed, and the sampling personnel shall make detailed records; each sample shall also be affixed with a label indicating the point number, sampling date and time, measurement items, etc.

The trace should be correct and clear. The sampling record is reported to the laboratory along with the sample.

4.7 Sampling device

4.7.1 Air sampler

It is composed of flow meter, flow regulating valve, flow stabilizer, timer and sampling pump. The sampling flow range is 0.10L/min~ 1.00L/min, the flow meter should not be lower than 2.5 level.

4.7.2 Glass syringe

It is suitable for collecting the gas to be tested with stable chemical properties, no chemical reaction with glass and high concentration.

4.7.3 Air sampling bag

It is suitable for collecting the gas to be measured that is chemically stable and does not react with the sampling bag, such as VOCs. Use metal-lined sampling the bag can extend the storage time of the sample, and it can also use a PTFE sampling bag.

4.7.4 Shock absorption bottle

Suitable for collecting gaseous substances.

4.7.5 Perforated glass plate absorption bottle

Suitable for collecting gaseous or gaseous and aerosol coexisting substances.

4.7.6 Solid adsorption tube

It is suitable for collecting gaseous substances that can be adsorbed by the solid adsorbent in the adsorption tube and easily desorbed.

4.7.7 Membrane

Suitable for collecting aerosols with low volatility, such as inhalable particles. Commonly used filter materials are glass fiber filter membrane, polyvinyl chloride fiber filter Membrane, microporous membrane, polytetrafluoroethylene membrane, quartz membrane, etc.

4.7.8 Stainless steel sampling tank

The inner wall of the stainless steel sampling tank is polished or silanized, used for the sampling of VOCs in the air of the archive warehouse. According to sampling requirements Seek, choose different volume sampling tanks. The sampling tank is evacuated before use, and the sampling tank can be placed on the Take samples at time and send them back to the laboratory for analysis.

4.8 Quality control of sampling

4.8.1 Sampling device

The sampling device should meet the relevant national standards and technical requirements, and pass the metrological verification. Before use, the instrument should be Inspection and calibration. The sampling device (including the sampling tube) cannot be exposed to direct sunlight during sampling.

4.8.2 Sampling staff

Sampling personnel must pass pre-job training to earnestly master sampling techniques.

4.8.3 Air tightness check

Powered samplers should check the air tightness of the sampling system before sampling, and no air leakage.

4.8.4 Flow calibration

Before sampling and after sampling, the sampling flow rate of the sampling system should be calibrated under the sampling load condition with a qualified level 1 soap film flowmeter.

Take the average of the two calibrations as the actual value of the sampling flow. The atmospheric pressure and temperature during calibration should be similar to those during sampling. Two calibration errors the difference must not exceed 5%.

4.8.5 On-site blank inspection when conducting on-site sampling, at least two sampling tubes should be left in the same batch, and they should be treated the same as other sample tubes.

When the site is blank during the process, after sampling, it will be sent to the laboratory together with other sampling absorption tubes. Measure the on-site blank value during sample analysis and compare it with the calibration the zero concentration value of the standard curve is compared. If the blank inspection exceeds the control range, this batch of samples is invalid.

4.8.6 Parallel sample inspection

The number of parallel samples in each batch of sampling shall not be less than 10%. For each parallel sampling, the relative deviation of the difference between the measured value and the average value must not be More than 20%.

4.8.7 Sampling volume correction

When calculating the concentration, the sampling volume should be converted to the volume under the standard state.

6.1 Test items

6.1.1 Basis for determination of test items

6.1.1.1 Select the test items required to be controlled in the relevant archival document preservation standards.

6.1.1.2 Select inspection items that will accelerate the deterioration of the file carrier material.

6.1.1.3 Select the substances that may be harmful to archive preservation that may be generated during the process of new construction or reconstruction of archive warehouses.

6.1.1.4 Choose to kill harmful organisms (such as sterilization, insecticide) and other circumstances that may be harmful to archive preservation.

6.1.1.5 Select the air-conditioning system pollution that may have an impact on archive preservation and harmful to archive preservation.

6.1.1.6 Select the test items that are required to be controlled in the indoor air quality standards and are related to archival work.

6.1.1.7 The selected test items should have national or industry standard analysis methods and industry-recommended analysis methods.

6.1.2 Test item content

6.1.2.1 The contents of the test items are shown in Table 1.

6.1.2.2 The air quality inspection of the archives warehouse should firstly detect and record the temperature, relative humidity, air flow rate, and temperature of the archives warehouse.

Air pressure.

6.1.2.3 After newly adding, transforming or overhauling ventilation equipment or air-conditioning equipment in the archives warehouse, the air velocity and fresh air volume shall be measured and recorded continuously at least.

Record the temperature and humidity fluctuations of the 24h equipment control environment, and the recording time interval shall not exceed 1h.

6.1.2.4 The newly built and renovated archive warehouses shall meet the requirements of Class II public construction projects in GB 50325, and the determination of formaldehyde, acetic acid, ammonia, Radon, TVOC, particulate matter, etc.

6.1.2.5 The archive warehouse shall determine the total number of colonies, including bacteria and molds.

6.1.2.6 Archive warehouses with centralized air conditioning systems or air purification equipment should detect ozone and particulate matter.

6.1.2.7 Archive warehouses in areas with high radioactive background concentrations should regularly check the concentration of radon in the air.

6.1.2.8 For archive warehouses that store silver salt photos or silver salt films, it is recommended to measure hydrogen sulfide in the air.

6.1.2.9 After the archives undergoing fumigation treatment are put into the warehouse, it is recommended to detect the residue of the corresponding fumigant in the air of the warehouse.

6.2 Analysis method

6.2.1 Principles for choosing analysis methods

6.2.1.1 First select the analysis method specified in the relevant evaluation standards.

6.2.1.2 When there is no specified method, the analysis method specified by national standards and industry standards should be selected, or industry recommended methods can be used.

6.2.1.3 In the testing of certain items, other equivalent analysis methods or methods developed by authoritative technical institutions can also be used, but they should be tested After passing the verification, its detection limit, accuracy and precision should be able to meet the quality control requirements of this standard.

6.2.1.4 The selected analysis method should comply with the relevant safety regulations and warehouse management regulations of the archive storage unit.

6.2.2 Analysis method content

6.2.2.1 Refer to Table 2 for the recommended detection and analysis methods for various physical parameters of the air in the archive warehouse.

6.2.2.2 Refer to Table 3 for recommended detection and analysis methods for exogenous pollutants in the air of archive warehouses.

6.2.2.4 The recommended detection and analysis methods for the residual fumigant in the air of the archive warehouse are shown in Table 5.

7.1 Test data processing

7.1.1 Recording and filing of test data

7.1.1.1 The original records of testing sampling, sample transportation, sample preservation, sample handover and laboratory analysis are important documents for testing.

Each column should be carefully filled in in the record form or special record book according to the prescribed format.

7.1.1.2 All original records should be correct and legible. If the data on the original record is wrong and need to be corrected, the wrong data should be Draw two horizontal lines; if the data that needs to be corrected becomes a piece, the data should be framed with a frame, and the word "void" should be indicated. On the wrong data the party writes the correct data and signs (or seals) at the bottom right. The original record must not be altered.

7.1.1.3 All records must be filled out on the spot and cannot be added afterwards.

7.1.1.4 No individual is allowed to destroy it without authorization. It should be archived and preserved on time. The original records involving the same test report should be archived together.

7.1.2 The number of significant digits reserved for the original record See Table 7 for the reserved digits of significant digits in original records.

7.1.3 Calibration curve regression processing and significant figures

7.1.3.1 When calculating with a calculator with regression statistics function, input the original data to directly display the correlation coefficient r and slope a, the intercept b, so as to obtain the unary regression equation.

7.1.3.2 r takes all 9 after the decimal point (but up to four digits after the decimal point) and the first non-9 rounded number.

7.1.3.3 The number of significant digits of a should be equal to the number of significant digits of the independent variable x, or at most one more than x should be reserved. the end of b One digit is equal to the last digit of the dependent variable y, or at most one digit more than y.

7.1.4 Statistical processing of test results

7.1.4.1 Statistics of test data

Mainly carry out three statistical calculations. average value, over-standard rate and over-standard multiple. The test data participating in the statistical calculation must be in accordance with this standard Request the obtained test data. Data obtained that does not meet the requirements of this standard shall not be reported or participate in statistical calculations. File warehouse empty the detection results of qi physical parameters do not undergo the above statistical processing.

7.1.4.2 Calculation of average

7.1.4.2.1 Calculation of the average value of the test data of a single measurement point of a single project

7.1.4.2.2 Calculation of the average value of test data of multiple measuring points for a single project

7.1.5 Digital rounding of test data and calculation rules

7.1.5.1 Number rounding

Figures are rounded up in accordance with the provisions of GB/T 8170-2008.

7.1.5.2 Calculation rules

7.1.5.2.1 When adding and subtracting operations, the number of effective digits after the decimal point should be the same as the number after the decimal point after the number is rounded.

The least significant digits are the same.

7.1.5.2.2 When multiplying and dividing operations, the number of significant digits of the number obtained after the rounding should be the same as the one with the least significant digits of the number participating in the operation the same.

7.1.5.2.3 When calculating the logarithm, the number of significant digits of the logarithm is the same as the true number.

7.1.5.2.4 When performing square, cube or square root operations, the number of significant digits of the calculation result is the same as the original number.

7.1.5.2.5 In the calculation, the number of significant digits such as the constants pi, e and 2, 1/3 is unlimited, and the number of significant digits is taken as needed.

7.1.5.2.6 A set of data (more than 4) from a normal population, the number of significant digits of its average can be increased by one more than the original number.

7.1.5.2.7 The data indicating the precision of the analysis result generally only takes one significant digit, and only two digits can be taken when the number of determinations is large.

And only two can be taken at most.

7.1.5.2.8 The number of digits that can be achieved by the effective digits of the analysis results cannot exceed that of the effective digits of the lowest detection concentration of the method.

Digits.

7.2 Evaluation and report of test results

7.2.1 Evaluation of test results

The test result is expressed as an average value. When the average value of physical, chemical, biological and radioactive indicators meets the requirements of the standard value, it is considered as up to standard;

When an inspection result fails to meet the standard requirements, it is considered non-compliant. And should evaluate whether a single project meets the standards.

7.2.2 Test report

The test report should include the following content. the party to be tested or the client, the test location, the test item, the test time, the test instrument, and the test basis Data, test results and signatures of inspectors, report writers, reviewers, and approvers, etc. The test report should be stamped with the test Use a seal, and must be stamped with a seam seal.

8.1 Basic requirements for inspectors

8.1.1 All staff engaged in air quality testing of archives warehouses should receive professional technical training and pass the assessment.

8.1.2 Correctly and proficiently master the operating technology and quality control procedures in environmental testing; be familiar with the laws, standards and regulations related to environmental testing management Regulations; learn and understand new technologies and methods of environmental testing at home and abroad.

8.1.3 The inspectors should organize and archive the inspection data obtained in time, fill in various inspection forms carefully, and write neatly. strict Falsification, alteration and forgery of data without authorization are prohibited.

8.1.4 Regular inspection, calibration and maintenance of the instruments, meters and various testing appliances used shall be carried out. Ability to master the equipment correctly the operation and use of the device can quickly determine the fault and eliminate the fault in time.

8.2 Quality control of sampling

See 4.8.

8.3 Quality control of on-site inspection

8.3.1 Personnel requirements

See 8.1.

8.3.2 Instrument calibration

The instrument must do periodic metrological verification or calibration as required. Before using the instrument, perform zero point calibration and span calibration.

Perform perfo...