GPA 2377-19涵盖了使用一段染色管测定天然气中H2S和CO2的浓度。所涵盖的范围为3 ppmv至5%（按体积计）H2S和0.25至10%（按体积计）CO2。本方法适用于碳氢化合物和空气中H2S和CO2的测定。自1977年作为试验方法采用以来，本标准仅进行了重印，很少进行修订。它于1984年被采纳为标准，1986年修订，1988年、1997年、1998年和1999年再版。当前版本更新了程序中使用的一些材料，根据今天的最佳实践，这些材料在收集样品或将样品运输到染色管（即胶胶管等）时会被发现过时。本标准最重要的补充是“警告声明”。本声明旨在告知用户，严格遵守制造商的说明至关重要。 制造商对每批染色管进行测试，以确保其符合规定的精度，每批或每盒染色管的使用方式可能略有不同，即暴露时间，指示颜色或污染物，此外，制造商的说明书将说明泵的多次或部分“拉力”测试所用的指数，或者如果允许的话。这些信息可能因批次和不同品牌的管子而异。同样重要的是，如果需要高精度和可重复性，而色谱法没有指示或不可行，则有许多便携式手持电子设备可用，它们在低功率下工作，本质上是安全的。因此，用户应该考虑染色管的长度是否是基于它们的情况和要求的最佳商业选择。

GPA 2377-19 covers the determination of the concentration of H2S and CO2 in Natural Gas using a length of stain tube. The ranges covered is 3 ppmv to 5% by volume H2S and 0.25 to 10% by volume of CO2. The Method as written is applicable to the determination of H2S and CO2 in hydrocarbons and in air. This Standard has seen only reprinting and few revisions since 1977 when it was adopted as a tentative method. It was adopted as a Standard in 1984, revised in 1986 and reprinted in 1988, 1997, 1998 and 1999. The current revision updates some materials used in the procedures which by today's best practices would be found obsolete in terms of what we would use to collect or transport a sample to the stain tube, i.e. gum rubber tubing, etc. The most significant addition to the Standard is a "Cautionary Statement". The intention of the statement is to inform the user that it is critical that manufacturer's instructions be followed implicitly. Each lot of stain tubes is tested by the manufacturer for compliance to stated accuracy and each lot or box of stain tubes quite possibly is slightly different in terms of how they are to be used, i.e. exposure times, indicating colors or contaminants, etc. Further the manufacturer's instructions will state the exponent to be used for multiple or partial testing "pulls" of the pump or if these are allowed at all. This information may vary from lot to lot and from one brand of tube to another. Also of significance is the concept that if high accuracy and repeatability is required and chromatography is not indicated or feasible, there are many portable handheld electronic devices available which operate on low power and are intrinsically safe. Therefore, the user should consider if a length of stain tube is really the best commercially available option based on their situation and requirements.