Process demonstration of rapid soil digestion method----Nanjing Binglab

Sample Equipment Introduction

Collect soil samples about 500g

Lab oven

Electronic balance class 0.1mg

Graphite digester

PTFE digestion tube

Experimental supplies: 200-mesh sieve, ruler, rolling pin, ziplock bag, PTFE centrifuge tube

The experiment includes: deionized water, superior pure hydrochloric acid, nitric acid, hydrofluoric acid and soil standard samples

Experimental supplies

Sample pretreatment:

Put the soil sample in the oven to dry;

Take out the dried soil samples and pick out the stones and sundries;

Fold the A4 paper in half, roll the soil sample into powder with a rolling pin, and sieve the ground soil sample with a 200-mesh sieve. The sieved samples are divided into 4 points, and the samples are stored in ziplock bags

Sample weighing:

Accurately extract 0.1g sample into a 50ml disposable centrifuge tube and weigh 2 parts in parallel

Digestion process
Add a little deionized water to wet the sample

Add a little deionized water to wet the sample

Add 3mlHCL, 1mlHNO3 1mlHF to each centrifuge tube

Put the lid on but don’t close it tightly

Put the centrifuge tube into the well of the graphite digester

Set the digestion temperature to 125 degrees, keep it for 120 minutes, and heat up for about 15 minutes

Start digestion, shake the centrifuge tube once half an hour

Shake the centrifuge tube once half an hour

Cap tightly and shake well
Soil sample pretreatment was completed.