colorimetric standard stock solution

例句：

1. 1. The colorimetricstandard stock solution is used to calibrate instruments.
   色度标准溶液用于校准仪器。
2. 2. The colorimetric method is asimple and accurate way to measure the concentrationof a substance.
   色度法是一种简单且准确的测量物质浓度的方法。
3. 3. The colorimetric test can detect the presence ofcertain chemicals in the sample.
   色度测试可以检测样品中某些化学物质的存在。