?u= Wed, 06 Nov 2024 02:30:10 +0000 en-US hourly 1 https://wordpress.org/?v=6.7.1 ?u=/wp-content/uploads/2024/11/cropped-icon-150x150.png ?u= 32 32 ?u=/product/publishers/jis/jis-k-14021992-amendment-12006/ Wed, 06 Nov 2024 02:30:10 +0000 Chromium Trioxide (Amendment 1)

Published By	Publication Date	Number of Pages
JIS	2006-03-25	4

]]> Chromium Trioxide (Amendment 1)

Published By	Publication Date	Number of Pages
JIS	2006-03-25	4

]]> ?u=/product/publishers/jis/jis-k-14021992/ Wed, 06 Nov 2024 02:30:10 +0000 Chromium Trioxide

Published By	Publication Date	Number of Pages
JIS	1992-07-01	15

]]> Chromium Trioxide

Published By	Publication Date	Number of Pages
JIS	1992-07-01	15

]]> ?u=/product/publishers/jis/jis-k-13512007/ Wed, 06 Nov 2024 02:30:04 +0000 Acetic Acid

Published By	Publication Date	Number of Pages
JIS	2007-06-20	32

]]> Acetic Acid

Published By	Publication Date	Number of Pages
JIS	2007-06-20	32

]]> ?u=/product/publishers/jis/jis-k-13211987/ Wed, 06 Nov 2024 02:30:04 +0000 Sulfuric Acid

Published By	Publication Date	Number of Pages
JIS	1987-05-01	5

]]> Sulfuric Acid

Published By	Publication Date	Number of Pages
JIS	1987-05-01	5

]]> ?u=/product/publishers/iso/iso-r-9151968/ Wed, 06 Nov 2024 01:08:10 +0000 Sulphuric acid and oleum for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrophotometric method

Published By	Publication Date	Number of Pages
ISO	1968-12	8

]]> 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 determination of iron content greater than 1 p.p.m.

]]> ?u=/product/publishers/iso/iso-r-9091968/ Wed, 06 Nov 2024 01:08:09 +0000 Hydrochloric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrophotometric method

Published By	Publication Date	Number of Pages
ISO	1968-12	8

]]> 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.

]]> ?u=/product/publishers/iso/iso-r-8491968/ Wed, 06 Nov 2024 01:08:07 +0000 Phosphoric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl spectrophotometric method

Published By	Publication Date	Number of Pages
ISO	1968-10	8

]]> 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 phosphate ions do not interfere). Spectrophotometric measurement of the coloured complex at a wavelength of about 522 nm.

]]> ?u=/product/publishers/iso/iso-r-19821971/ Wed, 06 Nov 2024 01:07:57 +0000 Nitric acid for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method

Published By	Publication Date	Number of Pages
ISO	1971-05	6

]]> The method is applicable to the determination of iron contents greater than 0,0001 % (m/m). The principle consists in evaporation of a test portion, taking up by means of hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of iron(II)-2,2' -dipyridyl complex in ammonium acetate medium. Photometric measurement of the coloured complex at a wavelength of about 522 nm.

]]> ?u=/product/publishers/iso/iso-9141977/ Wed, 06 Nov 2024 00:21:49 +0000 Sulphuric acid and oleum for industrial use — Determination of total nitrogen content — Titrimetric method after distillation

Published By	Publication Date	Number of Pages
ISO	1977-11	6

]]> The method is applicable to products having a total nitrogen content equal to or greater than 0.05 % (m/m). The principle consists in the conversion of the nitrogen present in a test portion to ammonia by means of nascent hydrogen. Distillation and absorption of the ammonia in an excess of standard volumetric sulphuric acid solution, and back-titration with a standard volumetric sodium hydroxide solution in the presence of an indicator. – Replaces ISO Recommendation R 914-1968.

]]> ?u=/product/publishers/iso/iso-9131977/ Wed, 06 Nov 2024 00:21:43 +0000 Sulphuric acid and oleum for industrial use — Determination of ash — Gravimetric method

Published By	Publication Date	Number of Pages
ISO	1977-11	4

]]> Based on evaporation of a test portion in a platinum dish, followed by ignition in an electric furnace, controlled at (850 50) °C, and weighing. – Replaces ISO Recommendation R 913-1968.

]]>