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水质分析概念详解(6):分析天平

Analytical Balance

Introduction

Analytical balances are accurate and precise instruments to measure weights. They require a draft-free location on a solid bench that is free of vibrations. Modern balances have built-in calibration weights to maintain accuracy. Older balances should be calibrated periodically with a standard weight. A few weighing tips follow:

• Do not bump or place objects on the bench after zeroing the balance.
• Weigh powders on weighing paper or in weighing dishes. Handle objects with tongs, gloves, or weighing paper to prevent fingerprints.
• Let hot objects cool before weighing.
• Weigh hygroscopic materials rapidly since they will absorb water during weighing.
• When making repetitive weighings always use the same procedure.

Picture of an analytical balance