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Standard Test Method for Hydrazine in Water (Includes all amendments And changes 9/11/2018).
Automaticky přeložený název:
Standardní zkušební metoda pro hydrazinu ve vodě
NORMA vydána dne 1.3.2013
Označení normy: ASTM D1385-07(2013)e1
Poznámka: NEPLATNÁ
Datum vydání normy: 1.3.2013
Kód zboží: NS-17125
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
ICS Number Code 13.060.50 (Examination of water for chemical substances)
Significance and Use | ||||||||||||||||
5.1 Hydrazine is a man-made chemical and is not found in natural waters. The determination of hydrazine is usually made on boiler feedwaters, process waters, and other waters that have been treated with hydrazine (N2H4) for the purpose of maintaining residuals to prevent corrosion by dissolved oxygen. This reducing chemical reacts with dissolved oxygen to form nitrogen and water. However, under certain conditions it can also decompose to form ammonia and nitrogen. Hydrazine is used extensively as a preboiler treatment chemical for high-pressure boilers to scavenge small amounts of dissolved oxygen that are not removed by mechanical aeration. It has the advantage over sulfite treatment in that it does not produce any dissolved solids in the boiler water. Hydrazine is often determined in concentrations below 0.1 mg/L. However, in layup solutions for the protection of idle boilers, hydrazine may be present in concentrations as high as 200 mg/L. 5.2 Additionally, hydrazine provides protection where reducing conditions are required, particularly in mixed metallurgy systems for the protection of the copper alloys. 5.3 Hydrazine is a suspected carcinogen and a threshold limit value in the atmosphere of 1.0 mg/L has been set by OSHA. When in an aqueous solution, hydrazine will oxidize to nitrogen and water in the presence of air over a relatively short period of time. |
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1. Scope | ||||||||||||||||
1.1 This test method covers1.2 It is the users' responsibility to ensure the validity of this test method for untested types of waters. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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.
Standard Practices for Sampling Water
from Flowing Process Streams Standard Guide for Spiking into Aqueous
Samples Standard Practice for Sampling Steam
(Includes all amendments and changes 12/31/2018). Standard Terminology Relating to Water
(Includes all amendments and changes 2/14/2024). Standard Specification for Reagent
Water Standard Practice for Writing Quality
Control Specifications for Standard Test Methods for Water
Analysis Standard Practice for Analysis of Metals,
Ores, and Related Materials by Spectrophotometry (Includes all
amendments and changes 6/29/2022). Standard Practice for Describing and
Measuring Performance of Ultraviolet and Visible
Spectrophotometers |
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