Abstract
In this work, monitoring the effect of packaging type and storage temperature on the short term stability of calibration standard solution KCl 1 M were conducted. The KCl 1M were packaged in two types of packaging i.e., high-density polyethylene (HDPE) and glass bottle. The effects of packaging type and storage temperature were monitored for four weeks at 25 °C and 40 °C. The conductivity values of KCl 1 M in the HDPE and glass bottle were 111.61 mS/cm and 111.62 mS/cm, respectively. The results indicated that the KCl 1M solution at 25 °C in both HDPE and glass bottle were found to be good in short term stability and there was no significant different between the two packaging types. At temperature of 40 °C, however, short term stability of the KCl 1 M in a glass bottle was better than the HDPE bottle.
Highlights
Reference material refers to sufficiently homogeneous and stable materials with respect to one or more specified properties, which has been established to be fit for its intended use in a measurement process [1]
The secondary RM is defined as the RM that measured by the secondary method and traceable to primary RM
Procedure of EC measurement The measurement of the EC value of RM for KCl 1 M solution in high-density polyethylene (HDPE) and glass bottles were conducted by the secondary method
Summary
Reference material (or RM in short) refers to sufficiently homogeneous and stable materials with respect to one or more specified properties, which has been established to be fit for its intended use in a measurement process [1]. Electrochemistry laboratory as part of chemical metrology Indonesia has started to be developed the production of RM, especially in electrolytic conductivity (or EC in short) measurement in the range of 111 mS/cm. This RM can be used as a standard solution to calibrate the conductivity meter in monitoring the quality of seawater [4]. The EC value of KCl 1 M that produced by electrochemistry laboratory was measured by the secondary method using Jones Cell type D. The stability of packaging for the RM solution (KCl) has been studied before, showing that a sealed ampoule is the most suitable packaging for EC RM [7] This type of packaging has disadvantages because a risk for substance to be contaminated with glass particles when the ampoules are opened [8]. In this work, the stability of RM is evaluated by monitoring the effect of the type of packaging (HDPE and glass bottle) and storage temperature (at 25 °C and 40 °C) for four weeks that specifies the duration and condition of transportation the RM to the end-user in Indonesia
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