Hydrochloric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrop...
The principle consists in evaporation of the test portion, taking up by means of hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of an iron(II)-2.2'-bipyridyl complex in a buffered medium at a pH value between 4.5 and 6. Photometric measurement of the coloured complex at a wavelength of about 522 nm.
Sulphuric acid and oleum for industrial use — Determination of iron content — 2,2'- Bipyridyl s...
The principle is based on evaporation of the test portion, taking up by means of hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of an iron(II) 2,2'-bipyridyl complex in a buffered medium at a pH value between 4.5 and 6. Spectrophotometric measurement of the coloured complex at a wavelength of about 522 nm. The method is applicable to the…
Sodium tripolyphosphate and sodium pyrophosphate for industrial use — Determination of iron content ...
Applicable to products having Fe contents of more than 0.001 % (m/m). Preliminary hydrolysis of polyphophates by prolonged boiling in the presence of hydrochloric acid. Reduction of iron(III) by means of hydroxylammonium chloride. Formation of the iron(II)-2,2'-dipyridyl complex in the presence of ammonium acetate at pH of 3.1 and a temperature of 75 °C (under the test conditions the…
Phosphoric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl spectropho...
Applicable to products having Fe contents of more than 0.001 % (m/m). Preliminary hydrolysis of polyphophate acids by prolonged boiling in the presence of hydrochloric acid. Reduction of iron(III) by means of hydroxylammonium chloride. Formation of the iron(II)-2,2'-dipyridyl complex in the presence of ammonium acetate at pH of 3.1 and a temperature of 75 °C (under the test conditions the…
Low-voltage fuses with high breaking capacity for industrial and similar purposes - Part 1: General...
Establishes the characteristics of fuses or parts of fuses (fuse-base, fuse-carrier, fuse-link) in such a way that they can be replaced by other fuses or parts of fuses having the same characteristics provided that their dimensions are identical. This publication supersedes IEC 66 (1953) and IEC 88 (1957).
Recommended Practice for the Installation of PVC Drain, Waste and Vent Pipe
and Pipe Fittings
1. SCOPE
1.1 Data Included
1.1.1 This Recommended Practice covers the installation of drain,
waste and vent systems for domestic, industrial and commercial plumbing.
1.1.2 This Recommended Practice includes handling instructions, system
repair, installation instructions, chemical resistance charts (Appendix A),
special environmental conditions, workmanship and…
Oil Fired Steam and Hot Water Boilers for Commercial and Industrial Use
1. Scope
1.1 This Standard applies to complete flue-connected, oil-fired steam and/or hot-water boilers, provided with automatic control devices.
1.2 This Standard applies to low pressure boilers intended for commercial and industrial use having an input of, or in excess of, 3 gph (US) (approximately 400,000 Btuh) and to high pressure boilers regardless of intended use or input. Note…
