ISO 911:1977 download free.Sulphuric acid for industrial use — Evaluation of sulphuric acid concentration by measurement of density.
1 SCOPE AND FIELD OF APPLICATION
ISO 911 specifies a method for the approximate evaluation of sulphuric acid (H2S04) concentration of sulphuric acid for industrial use, by measurement of density.
2 PRINCIPLE
Determination of the density at 20 °C by means of a hydrometer. Evaluation of the corresponding sulphuric acid (H2S04) concentration.
3 APPARATUS
Ordinary laboratory apparatus and
3.1 Hydrometer, graduated in 0,005 g/ml, calibrated at 20 °C (see SO/R 649).
3.2 Glass test tube, of capacity at least 500 ml, of diameter at least 25 mm greater than that of the hydrometer (3.1), and of height at least 25 mm greater than the immersion level of the hydrometer.
4 PROCEDURE
4.1 Determination of density
Place approximately 500 ml of the test sample in the glass test tube (3.2). Adjust the temperature of the contents of the test tube to 20 t 0,5 °C.
Plunge in the hydrometer (3.1) and, as soon as static equilibrium has been reached, verify again that the temperature of the acid is 20 ± 0,5 uC Read the density indicated on the hydrometer scale.
4.2 Evaluation of sulphuric acid (H2S04) concentration
Read from the table the concentration corresponding to the density indicated on the hydrometer.
5 EXPRESSION OF RESULTS
State the density read on the hydrometer, expressed in grams per millilitre, and the corresponding sulphuiic acid (H2S04) concentration obtained from the table.
6 TEST REPORT
The test report shall include the following particulars :
a) the reference of the method used;
b) the results and the method of expression used;
c) any unusual features note during the determination;
d) any operation not included in ISO 911 or regarded as optional.
ISO PUBLICATIONS RELATING TO SULPHURIC ACID AND OLEUM FOR INDUSTRIAL USE
Iso 910 – Determination of total acidity, and calculation of free sulphur trioxide content of oleum — Titrimetric method.
ISO 911 — Evaluation of sulphuric acid concentration by measurement of density.
ISO 912 — Determination of sulphur dioxide content — Barium sulphate gravimetric method.
ISO 913 — Determination of ash — Gravimetric method.
ISO 914 — Determination of total nitrogen content — Titrimetric method after distillation.
ISO/R 915— Determination of iron content — 2,2’-Bipyridyl spectrophotometric method.
ISO 2363 — Determination of oxides of nitrogen — 2,4-Xylenol spectrophotometric method.
ISO 2717 — Determination of lead content — Dithizorie photometric method.
ISO 2877 — Determination of chlorides content — Potentiometric method.
ISO 2899 — Determination of ammoniacal nitrogen content — Spectrophotometric method.
ISO 3423 — Determination of sulphur dioxide content — lodometric method.
ISO 5792 — Determination of arsenic content — Silver diethyldithiocarbamate photometric method.