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
中科院分区:
文献类型:
--
作者:
K. Pratt
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.