1.1本规程用于确定任何燃烧装置或可能存在氰化物的大气中气态氰化氢（HCN）的浓度。虽然主要用于测量气相HCN，但本实施规程中描述的样品收集也包括氰化物离子（CN - )采样大气中可能存在的吸收颗粒。 1.1.1样品可从密闭室中采集，如试验方法E 662中所述的NBS烟箱，前提是其配备有采样口。 1.1.2通过这种做法，可以监测工业工作区或大规模火灾等开放室的HCN。 1.1.3流经系统的HCN排放可通过从其排放烟囱中取样来确定。此类系统的示例包括大规模制造应用和试验方法E 1354中所述的锥形量热器。 1.2本规程可用于监测实验室规模火灾烟气排放中的HCN水平，以估计燃烧材料产生的气体的毒性。 见指南E 800。 1.3氰化氢的浓度范围取决于采样气体的体积、采样期间放置在冲击式采样器中的氢氧化钠溶液的体积以及用于测量氰化物的分析方法。例如，检测下限为0.002-mg/m 3. 当0.1米 3. 当使用试验方法D 6888中所述的流动注射分析（FIA）系统时，根据撞击式除尘器溶液中0.002 mg/L氰化物的检测限，将燃烧流出物收集到100 mL氢氧化钠溶液中。 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 氰化氢有毒。 氰化氢含量相对较低时会导致窒息和死亡。 国家消防协会已将氰化氢的易燃性等级定为4级（严重火灾危险）。

1.1 This practice is used to determine the concentration of gaseous hydrogen cyanide (HCN) from any combustion device or atmosphere where cyanide may be present. While primarily designed for the measurement of gas phase HCN, the sample collection described in this practice also includes cyanide ion (CN - ) absorbed particles that may be present in the sampling atmosphere. 1.1.1 Samples can be collected from a closed chamber such as the NBS smoke box described in Test Method E 662 provided it is equipped with sampling ports. 1.1.2 Open chambers such as industrial work areas or large scale fires can be monitored for HCN with this practice. 1.1.3 The HCN emissions of a flow through system can be determined by sampling from its discharge stack. Examples of such systems include large scale manufacturing applications and the cone calorimeter described in Test Method E 1354. 1.2 This practice can be used to monitor HCN levels in lab scale fire smoke effluents in order to estimate toxicity of gases produced from burning materials. See Guide E 800. 1.3 The concentration range of hydrogen cyanide will be dependent on the volume of gas sampled, the volume of sodium hydroxide solution placed in the impinger during sampling, and the analytical method used to measure cyanide. For example, the lower limit of detection would be 0.002-mg/m 3 when 0.1-m 3 of combustion effluent is collected into 100-mL sodium hydroxide solution based on a detection limit of 0.002 mg/L cyanide in the impinger solution when using the flow injection analysis (FIA) system described in Test Method D 6888. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== Hydrogen cyanide is highly toxic. In relatively low quantities, hydrogen cyanide can cause asphyxia and death. The National Fire Protection Association has assigned a flammability rating of 4 (severe fire hazard) to hydrogen cyanide.