Kelp heavy metal determination pre-treatment method

Abstract

The present invention relates to a kelp heavy metal determination pre-treatment method, which comprises: (1) drying and crushing kelp to be determined, and screening with a 40 mesh sieve; (2) weighing 0.2 g of the kelp powder, placing into a high pressure digestion tank, adding 65% nitric acid, and standing for 1-2 h; (3) placing the digestion tank into a microwave digestion device, setting the microwave digestion device maximum power of 800 W and the climbing time of 5 min, and maintaining for 3 min at a temperature of 120 DEG C; (4) setting the microwave digestion device maximum power of 800 W and the climbing time of 6 min, and maintaining for 15 min at a temperature of 164 DEG C; (5) after completing the digestion, cooling to a temperature of less than 40 DEG C, and taking out the digestion tank; and (6) transferring the digestion solution into a volumetric flask, carrying out volume metering with ultra-pure water, uniformly shaking, and standing overnight so as to detect for spare. According to the present invention, the method has advantages of short time consumption, simple operation, saving of inorganic acids and other reagents, and complete sample digestion.

Description

technical field [0001] The invention relates to a pretreatment method for determining heavy metals in kelp. Background technique [0002] Before the heavy metal content in the sea-tangle is measured, the sea-tangle must be carried out pretreatment earlier that is the preparation of analysis sample: the heavy metal element in the sample is transformed into soluble salt and is dissolved in solution. As we all know, sample pretreatment is a vital link that cannot be underestimated in the elemental analysis process. The correctness of the pretreatment method is the key to control the accuracy of the experimental results. The loss of elements and contamination during this process will cause errors in the results. At present, the pretreatment methods of food samples are mainly wet digestion, dry digestion and microwave digestion. Earlier, foreign researchers explored the process steps of food sample digestion. It started relatively late in China, but microwave digestion is cur...

AI Technical Summary

Problems solved by technology

At present, microwave digestion technology is widely used and involves many fields, but there is no relevant research report on the optimization of kelp digestion process.