Table T2. Techniques, standards, typical accuracy, and reproducibility for interstitial water analyses.

Table T2. Techniques, standards, typical accuracy, and reproducibility for interstitial water analyses.


Analysis	Technique	Standard	Reproducibility (% rsd-1 )
Alkalinity	AT	Sodium carbonate solutions	2.1
Cl^-	T	IAPSO	0.3
SO₄^2-	IC	IAPSO	1.2
HPO₄^2-	S	Solution, weighed	1.0
NH₄⁺	S	Solution, weighed	5.9
Na⁺	ICP	IAPSO	1.8
K⁺	ICP	IAPSO	1.2
Mg²⁺	ICP-AES	IAPSO	0.9
Ca²⁺	ICP-AES	IAPSO	0.7
Mn²⁺	ICP-AES	Dilutions of reference solutions in acidified NaCl matrix	2.1
Fe²⁺	ICP-AES	Dilutions of reference solutions in acidified NaCl matrix	2.9
B	ICP-AES	Dilutions of reference solutions in acidified NaCl matrix	3.1
Sr²⁺	ICP-AES	Dilutions of reference solutions in acidified NaCl matrix	2.3
Ba²⁺	ICP-AES	Dilutions of reference solutions in acidified NaCl matrix	2.0
Li⁺	ICP-AES	Dilutions of reference solutions in acidified NaCl matrix	2.2
DOC	TOC	Potassium phthalate standard	1.9

Notes: AT = autotitration, T = titration, IC = ion chromatography, S = spectrophotometry, ICP-AES = inductively coupled plasma-atomic emission spectrophotometry, TOC = total carbon analyzer. rsd-1 = one sigma relative standard deviation. IAPSO = International Association for the Physical Sciences of the Ocean.