TY - JOUR
T1 - Direct pH measurement of NaCl-bearing fluid with an in situ sensor at 400°C and 40 megapascals
AU - Ding, Kang
AU - Seyfried, William E.
PY - 1996/6/14
Y1 - 1996/6/14
N2 - The pH of concentrated NaCl-HCl fluids (0.57 mole of NaCl per kilogram of water) has been measured at supercritical conditions of water with a yttria-stabilized zirconia sensor in a titanium flow reactor. At 400°C and 40 megapascals, the in situ pH of the fluids, ranging from 3.3 to 6.2, differs greatly from its original value of 1.9 to 7.6 at ambient conditions. The measurements agree well with theoretical predictions, showing strong associations of HCl° and NaOH° complexes in high-temperature fluids. The pH sensor provides a powerful tool to investigate unambiguously the distribution of species in aqueous fluids at elevated temperatures and pressures.
AB - The pH of concentrated NaCl-HCl fluids (0.57 mole of NaCl per kilogram of water) has been measured at supercritical conditions of water with a yttria-stabilized zirconia sensor in a titanium flow reactor. At 400°C and 40 megapascals, the in situ pH of the fluids, ranging from 3.3 to 6.2, differs greatly from its original value of 1.9 to 7.6 at ambient conditions. The measurements agree well with theoretical predictions, showing strong associations of HCl° and NaOH° complexes in high-temperature fluids. The pH sensor provides a powerful tool to investigate unambiguously the distribution of species in aqueous fluids at elevated temperatures and pressures.
UR - http://www.scopus.com/inward/record.url?scp=0001687570&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0001687570&partnerID=8YFLogxK
U2 - 10.1126/science.272.5268.1634
DO - 10.1126/science.272.5268.1634
M3 - Article
AN - SCOPUS:0001687570
SN - 0036-8075
VL - 272
SP - 1634
EP - 1636
JO - Science
JF - Science
IS - 5268
ER -