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GB/T 34710.1-2017 (GB/T34710.1-2017)

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GB/T 34710.1-2017: PDF in English (GBT 34710.1-2017)

GB/T 34710.1-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.040.40
G 86
Classification of the mixture gas -
Part 1. Toxic classification
ISSUED ON. NOVEMBER 01, 2017
IMPLEMENTED ON. MAY 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Terms and definitions ... 4 
3 Abbreviations ... 4 
4 Toxic classification of mixture gas ... 4 
5 Calculation method of LC50 of mixture gas ... 5 
6 Examples of calculation and determination ... 5 
Appendix A (Informative) LC50 values of some gases ... 7 
Classification of the mixture gas -
Part 1. Toxic classification
1 Scope
This Part of GB/T 34710 specifies the method for toxic classification of mixture
gas.
This Part applies to the toxic classification of mixture gas.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1 Lethal concentration 50
The concentration of the gas in the air which can cause the tested mice to die
half in 14 d after being continuously inhaled by healthy male and female adult
white mice for 1 h.
2.2 Toxic gases
The gas with a LC50 value not more than 5000×10-6 (volume fraction).
3 Abbreviations
The following abbreviations apply to this document.
Lethal concentration 50
4 Toxic classification of mixture gas
The toxic classification of mixture gas shall comply with the provisions of Table
1.
Table 1 -- Toxic classification of mixture gas
b) Determination of toxicity. Since the LC50 value of the mixture gas is
1780000×10-6 (volume fraction), according to Table 1, the toxicity of this
mixture gas is Class 1. non-toxic.
6.3 The LC50 value of the mixture gas having a sulfur dioxide content of 500×10-
6 (volume fraction), a nitrogen dioxide content of 500×10-6 (volume fraction),
and nitrogen is calculated; and the toxicity is determined.
a) Calculation steps. The toxic gases in the mixture gas is sulfur dioxide and
nitrogen dioxide. According to Appendix A, the LC50 value of sulfur dioxide
is 2520×10-6 (volume fraction); and the LC50 value of nitrogen dioxide is
115×10-6 (volume fraction). Calculate according to formula (1) as follows.
b) Determination of toxicity. Since the LC50 value of the mixture gas is
220000×10-6 (volume fraction), according to Table 1, the toxicity of this
mixture gas is Class 1. non-toxic.
6.4 The LC50 value of the mixture gas having a boron trichloride content of
12×10-2 (volume fraction), a chlorine gas content of 8×10-2 (volume fraction),
and argon is calculated; and the toxicity is determined.
a) Calculation steps. The toxic gases in the mixture gas is boron trichloride
and chlorine gas. According to Appendix A, the LC50 value of boron
trichloride is 2541×10-6 (volume fraction); and the LC50 value of chlorine
gas is 293×10-6 (volume fraction). Calculate according to formula (1) as
follows.
b) Determination of toxicity. Since the LC50 value of the mixture gas is
312.2×10-6 (volume fraction), according to Table 1, the toxicity of this
mixture gas is Class 2. toxic.
(Volume fraction)
(Volume fraction)
(Volume fraction)
......
 
(Above excerpt was released on 2019-01-01, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT34710.1-2017