ASTM D3712 Standard Test Method of Analysis of Oil-Soluble Petroleum Sulfonates by Liquid Chromatography
1. Scope
1.1 This test method covers the analysis of refined and crude natural and synthetic oil-soluble sulfonate products. Resins, if present, are recovered with the oil phase and carboxylates are recovered as sulfonates.
1.2 This test method covers the determination of mineral oil, sodium sulfonate, inorganic salts, water, basicity or acidity, average molecular weight, and relative density of sodium sulfonate products.
1.3 This test method covers the determination of mineral oil, sulfonate, water, base number, average molecular weight, and relative density of calcium, barium, magnesium, and ammonium sulfonate products.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D95 Test Method for Water in Petroleum Products and Bituminous Materials by Distillation
D2896 Test Method for Base Number ofPetroleum Products by Potentiometric Perchloric Acid Titration
3. Terminology
3.1 Symbols:
3.1.1 Following are definitions of the symbols used in Section 17, and as noted in the sections in parentheses.
A = grams of sample of calcium, barium, magnesium, or ammonium sulfonate (8.1.1).
B = volume of chloroform solution, mL (10.1).
C = grams of sample of sodium sulfonate (10.1.1).
D = grams of oil recovered (10.4).
E = grams of sodium sulfonate recovered (10.5).
F = grams of residue from chloroform blank (10.6).
G = grams of residue from alcohol blank (10.6).
H = grams of sodium sulfonate (11.1).
I = grams of sodium sulfate ash from sodium sulfonate (11.2).
J = T/KS.
K = valence of cation.
S = average equivalent weight of sodium sulfonate (17.1.4).
T = average molecular weight of calcium, barium, magnesium, or ammonium sulfonate (17.1.5).
U = percentage of sodium sulfonate (17.1.2).
V = percentage of calcium, barium, magnesium, or ammonium sulfonate (17.1.3).
Wc = grams of water contained in pycnometer at 25°C (6.9).
Ws = grams of sample contained in pycnometer at 25°C (15.1).
X = grams of sodium sulfonate sample for basicity (12.1).
Y = volume of standard H2SO4 or NaOH solution used to determine basicity or acidity (12.1).
Z = normality of standard H2SO4 or NaOH solution to determine free basicity or acidity (12.1).
AA = grams of sodium sulfonate product ashed (13.1).
BB = grams of sodium sulfate from inorganic salt determination (13.1).
CCA = percentage of free acidity of sodium sulfonate product as H2SO4 (17.1.6).
CCB = percentage of free basicity of sodium sulfonate product as NaOH (17.1.6).
DD = percentage of inorganic salts as sodium sulfate (17.1.7).
