Measurement of pHT values of Tris buffers in artificial seawater at varying mole ratios of Tris:Tris·HCl

Measurement of pHT values of Tris buffers in artificial seawater at varying mole ratios of Tris:Tris·HCl
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测量不同 Tris:Tris·HCl 摩尔比的人工海水中 Tris 缓冲液的 pHT 值

DOI:
10.1016/j.marchem.2014.03.003
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发表时间:
2014
期刊:
影响因子:
3
通讯作者:
K. Pratt
K. Pratt
中科院分区:
地球科学2区
文献类型:
--
作者:
K. Pratt

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在盐度为35的人工海水(ASW)中,以2-氨基-2-羟甲基-1,3-丙二醇(Tris)为缓冲液,在Tris与Tris·HCl的摩尔比为0.03:0.05,0.04:0.04和0.05:0.03时,测定了Harned细胞的总pH值pHT。ASW配方来源于2008年国际海洋物理科学协会(IAPSO)的海水组成(Millero等人,2008年)。在288.15 K、298.15 K和308.15 K(15 ℃、25 ℃和35 ℃)下测量各缓冲液的pH值。提供了符合ISO GUM(JCGM,2008)的每个缓冲液的测量不确定度。这些新配方将ASW中Tris缓冲液的可用数据扩展到298.15 K时天然表面海水的pHT范围。这些数据提供了一个框架,为未来的多点校准的分光光度计和电位pHT测量可追溯到这些新的缓冲液。
Measurements of total pH, pHT, in Harned cells are reported for 2-amino-2-hydroxymethyl-1,3-propanediol (Tris) buffers in artificial seawater (ASW) of salinity 35 at three molality ratios of Tris to Tris·HCl: 0.03:0.05, 0.04:0.04, and 0.05:0.03. The ASW formulation was derived from the 2008 International Association for the Physical Sciences of the Oceans (IAPSO) composition of seawater (Millero et al., 2008). The pHTvalue of each buffer was measured at 288.15 K, 298.15 K, and 308.15 K (15 °C, 25 °C, and 35 °C). Measurement uncertainties compliant with the ISO GUM (JCGM, 2008) are provided for each buffer. These new formulations extend the available data for Tris buffers in ASW to pHTvalues that bracket the pHTrange of natural surface seawaters at 298.15 K. The data provide a framework for future multiple-point calibrations of spectrophotometric and potentiometric pHTmeasurements traceable to these new buffers.