How to determine the digestion time of samples

The methods to determine the digestion time of the sample include observing color change method and conventional digestion method.

1. Observe the color change method: determine the digestion time by observing the color change of the sample. When the sample appears transparent blue-green, it can be digested for 30 to 60 minutes.

2. Conventional digestion method: Conventional digestion method is a common method to determine digestion time. The sample needs to be digested for 2 to 3 hours. This method is suitable for most samples, but the specific time will be different due to the nature of the samples and experimental conditions.