T/LZZLXH 059-2021 Active Group standards

T/LZZLXH 059-2021 Chemical analysis titration operation procedures for inspection and testing organizations

Publish Date: 2021-03-25 Implement Date: 2021-04-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/LZZLXH 059-2021

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Economic and cultural

ICS Name: Chemical analysis

Publish Date: 2021-03-25

Implement Date: 2021-04-01

Scope

Scope: This document specifies the terms and definitions for titration operations in chemical analysis by inspection and testing institutions, titration measuring devices, verification and checking, preparation of measuring devices, solution injection, titration operations, and cleaning and placement of titration pipettes after use. This document is applicable to titrations using stoppered and unstoppered titration pipettes in volumetric analysis. Main technical content: 6.3 Lubrication and leak testing of stoppered titration pipettes 6.3.1 Applying lubricant: Place the titration pipette flat, remove the stopper, wipe the stopper and stopper groove dry, and take a small amount of Vaseline (or silicone grease). Apply it evenly around the orifice end of the stopper (not exceeding the orifice) and the thick end of the stopper (not exceeding the orifice). Insert the stopper into the orifice and rotate it in the same direction. Observe that the stopper and stopper groove are transparent and flexible when viewed from the outside. Secure the stopper with a rubber band. If the lubricant blocks the orifice, place the stopper and lower end of the titration pipette in hot water to melt and drain the lubricant, then reapply it. 6.3.2 Leak testing: Fill the titration pipette with water and adjust the liquid level to the "0" scale line. Hold the titration pipette on the titration pipette holder for about 2 minutes. Check that there is no leakage from the lower end of the titration pipette and both ends of the stopper. Observe that the liquid level does not drop. Rotate the stopper 180° and check again. If there is leakage, reapply lubricant. 6.4 Leak testing of unstoppered titration pipettes 6.4.1 Check whether the latex tubing is aged and whether the glass beads are of appropriate size. 6.4.2 Leak testing: Fill the titration pipette with water and adjust the liquid level to the "0" scale line. Hold the titration pipette upright on the titration pipette holder for