Table 1. Analytical techniques for vent water analyses 



Analyte 



Alkalinity 



H 3 



J He 



Mg 2+ 

 H 4 Si0 4 



H 2 S 



CI" 



Ca 



2+ 



Mn 



2 + 



Fe 



2+ 



Method 



Potentiometric, end point by 

 titration (la: 0.2%, PMEL, 

 shipboard) 



Potentiometric, NBS buffers, 

 25*C (la: <0.25% as pH, PMEL, 

 shipboard) 



Mass spectrometry (la: 1.0%, 

 UCSB) 



Reference 



Dyrssen (1965) 



Zirino (1975) 



Lupton et al 

 (1980) 



EDTA titration (la: 0.5%, UW) Gieskes (1974) 



Colorimetric-f low injection, 

 silico-molybdate complex 

 (la: 1.0%, UW) 



Colorimetric, methylene blue, 

 samples preserved as ZnS 

 (la: 5%, UW) 



Potentiometric titration 

 (la: 0.1%, UW) 



Thomsen et al. 

 (1983) 



Cline (1969) 



McDuff (1985) 



EGTA titration (la: 0.5%, UW) Gieskes (1974) 



Flame atomic absorption 

 spectrophotometry 

 (la: 5%, PMEL) 



Flame atomic absorption 

 spectrophotometry 

 (la: 5%, PMEL) 



Perkin Elmer 

 Manual 



Perkin Elmer 

 Manual 



38 



