EN ISO 8819:1995 PDF

Name: EN ISO 8819:1995 — Liquefied petroleum gases - Detection of hydrogen sulfide - Lead acetate method (ISO 8819:1993)
SKU: EN ISO 8819:1995
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Liquefied petroleum gases - Detection of hydrogen sulfide - Lead acetate method (ISO 8819:1993)

Название (английский):

EN ISO 8819:1995

Liquefied petroleum gases - Detection of hydrogen sulfide - Lead acetate method (ISO 8819:1993)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 6
Дата публикации:: 10 января 1995 г.
Издание:: CEN EN 8819 edition 1 version 1
ICS:: 75.160.30

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Описание (английский):

Specifies a procedure for the detection of hydrogen sulfide. The lower limit of detectability is 4 mg of hydrogen sulfide in 1 m^3 of gas. Methyl mercaptan, if present, produces a transistory yellow stain on the lead acetate paper which, however, fades completely in less than 5 min. Other sulfur compounds present in the gas do not interfere with the test.

Abstract

Похожие стандарты

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Overview

EN ISO 8819:1995 (ISO 8819:1993) specifies a simple, qualitative procedure for the detection of hydrogen sulfide (H2S) in liquefied petroleum gases (LPG) using the lead acetate method. The procedure detects H2S at a lower limit of 4 mg H2S per 1 m³ of gas. The method is intended for on‑site assessment of H2S presence and distinguishes transient responses (e.g., methyl mercaptan) from persistent H2S staining.

Key topics and technical requirements

Detection principle: Vaporized LPG sample is passed over moist lead acetate paper; H2S reacts to form lead sulfide, producing a colour change from yellow to black.

Limit of detectability: 4 mg H2S / 1 m³ gas.

Interferences: Methyl mercaptan causes a transitory yellow stain on lead acetate paper that fades within 5 minutes; other sulfur compounds present do not interfere with the test.

Test apparatus and materials:

Lead acetate test paper prepared by dipping filter paper into a 50 g/L aqueous lead acetate solution or commercially equivalent paper.
Paper strip dimensions: approx. 51 mm × 9.5 mm with a 3.5 mm hole for hanging.
Test rig includes a glass cylinder, water reservoir at 60–80 °C, stainless steel tubing and a needle valve; flow indicator measuring 2–3 L/min.

Operating conditions: Adjust flow to 2.3 L/min ± 0.2 L/min and expose the paper for exactly 2 minutes. Flush sample lines for ~1 minute before testing.

Sampling guidance: Prefer direct connection to the sample source; avoid rubber hoses and, where possible, avoid use of sample cylinders because of adsorption/contamination risks discussed in Annex A.

Test reporting: Reports must include product identification, reference to EN ISO 8819, test result (H2S positive/negative or methyl mercaptan present), deviations from procedure, and test date.

Safety note: Standard warns of hazardous materials and operations; users must follow appropriate safety and regulatory measures.

EN ISO 8819:1995 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications

Who uses this standard

Related standards

Технические детали

ISO 8819:1993

Liquefied petroleum gases — Detection of hydrogen sulfide — Lead acetate method

SIST EN ISO 8819:1998

Liquefied petroleum gases - Detection of hydrogen sulfide - Lead acetate method (ISO 8819:1993)

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