The bismuth compound, like the arsenic compound, forms a complex with the nucleic acid, and when it accumulates in the organ, it can cause carcinogenesis. When the soluble bismuth salt, especially barium fluoride, comes into contact with the skin, dermatitis occurs. Most of the solid compounds of hydrazine are toxic dangerous goods. In the air of the laboratory or factory, the maximum allowable amount of strontium element should not exceed 2 μg/m 3 on average 8 hours per day. Further, even if the average amount per day may be less than 2 μg/m 3 , the person cannot stay in an environment in which the cerium concentration exceeds 25 μg/m 3 in a short time (for example, half an hour).
Calcium is essential for all cellular organisms. Whether in the muscles, nerves, and bones have mucus in combination with Ca 2 + ions protein. Calcium has many important physiological functions that play an indispensable role in the regulation of muscle cell and nerve cell responses during coagulation; it affects cell membrane penetration, and also plays a role in certain enzyme systems. The normal amount of calcium a person needs per day is 0.7 to 1.0 g. Calcium accounts for about 2% of the body's weight, and about 99% of it is in bones and teeth. One hydroxy phosphate 3Ca 3 (PO 4) 2 · Ca (OH) 2 is the major inorganic component of these structures. The normal concentration of calcium in the blood is 9 to 11.5 mg per 100 mL of plasma.
Earthworms are trace elements, often accompanied by calcium, and have not been found to have significant physiological effects. SrBr 2 has been used as a sedative containing Br - ion in medicine.
The soluble salts of strontium are extremely toxic. The toxicity of strontium salt is to stimulate the muscles (without nerve stimulation) and can cause fibrillation of the ventricles. Symptoms of sputum poisoning are: excessive salivation, vomiting, abdominal cramps, violent diarrhea, convulsive tremors, strong veins, high blood pressure, and kidney, bowel and stomach bleeding. The lethal amount of BaCl 2 is 0.8 to 1.0 g. The less lethal amounts of BaS and BaCO 3 are larger, but they can be converted into highly soluble BaCl 2 in the stomach by HCl. The poisoning of cockroaches is very fast, usually from a few hours to a few days.
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