The arsenic, mercury and their compounds contained in fertilizers mainly come from mineral raw materials, industrial and household waste, livestock manure and other raw materials, and are usually referred to as heavy metal elements. The presence of these harmful elements in fertilizers has caused pollution to the ecological environment of farmland, affecting the growth and development of crops, and posing a great threat to food safety and human and animal health.

Fertilizer has made important contributions to the increase of crop yields, but at the same time, it has also brought about pollution of farmland soil and groundwater. With the implementation in our countrystrictThe ecological environment protection system strictly controls the harmful elements arsenic and mercury in fertilizers, which plays an important role in preventing soil pollution and ensuring human and animal safety.

Beijing Haotianhui Instrument Co., Ltd. conducts analysis and data collection for the determination of arsenic and mercury in fertilizers using atomic fluorescence method.

arsenic

Arsenic is widely distributed in nature, and trace amounts of arsenic can be found in animal bodies, plants, and seafood. Due to the widespread use of arsenic containing pesticides, the problem of arsenic pollution to the environment has become increasingly serious. If arsenic compounds are used as feed additives and excessively added to the feed consumed by livestock, it is easy for arsenic to accumulate in the animal's body. After consuming meat products from such livestock, it is easy to cause poisoning. After arsenic invades the human body, it accumulates in areas such as osteoporosis, liver, kidneys, spleen, muscles, hair, nails, etc., in addition to being excreted in urine, digestive tract, saliva, and breast. Arsenic acts on the nervous system, stimulates hematopoietic organs, and can invade the human body in small amounts over a long period of time, stimulating the production of red blood cells. Long term exposure to arsenic can cause cell toxicity and capillary toxicity, and may also induce malignant tumors.

mercury

Mercury mainly accumulates in animal bodies, and factories discharge mercury containing wastewater that pollutes water bodies. Aquatic plants and products in lakes, swamps, etc. are prone to accumulate large amounts of mercury, which is transmitted through the food chain and accumulates in the human body. The parts of the body where mercury accumulates the most are bones, kidneys, liver, brain, lungs, heart, etc. Mercury compounds form loose protein compounds with proteins. Therefore, it has a corrosive effect on the organization.

Equipment and reagents:

AFS-100Atomic Fluorescence Spectrometer (developed by Beijing Haotianhui Instrument Co., Ltd.)As/HgCoding hollow cathode lamp, temperature controlled electric heating plate (room temperature to)250Adjustable within ℃), exhaust equipment, hydrochloric acid, nitric acid1000ng/mlofAsStandard solution100ng/mlofHgStandard solution, aqua regia (hydrochloric acid and nitric acid in volume ratio)3:1Mixed placement20minFor later use, the concentration is10%Ascorbic acid+10%Thiourea mixed solution (prepared for immediate use), with a concentration of0.5%Sodium hydroxide+1.5%ofKBH4Mixed solution (prepared for immediate use).

Sample processing:

After multiple fractions of the solid sample, approximately100g,Grind it quickly until it passes through completely0.50mmAperture sieve(If the sample is damp, it can be passed through100mmsieve),Mix well,Placed in a clean and dry container;After multiple shaking cycles, the liquid sample,Quickly retrieve approximately100mL,Place in a clean and dry container.

Weigh the sample