Barium sulfate is generally non-toxic to humans, and barium sulfate belongs to insoluble deposits that are not digested in the body and excreted. In the hospital to do gastric examination, it is the use of barium sulfate non-toxic to the human body. In addition to barium sulfate, some other soluble barium salts or barium salts that react with gastric acids are harmful to humans, because heavy metal ions can destroy human proteins and impede the normal biochemical response of the human body. Barium sulfate insoluble in water, insoluble in sulfuric acid, hydrochloric acid, nitric acid and other strong acids. Barium sulfate is used as a barium meal in human gastric juice, which contains low levels of hydrochloric acid. Taking barium meal as a contrast agent of gastroscope is basically harmless to the body. Barium carbonate must not be used because barium chloride is soluble in hydrochloric acid to produce highly toxic barium chloride, which causes death.

　　硫酸钡防护措施：

　　Barium sulfate, protective measures:

　　1、硫酸钡无害，不小心溅到身上，用水搓洗即可。

　　1, barium sulfate and harmless, careful not to splash water to scrub.

　　2、长久工作在这样的环境，容易患职业病：尘肺。硫酸钡生产时，工人应该做好防护措施，配带劳保。

　　2, long-term work in such an environment, prone to occupational diseases: pneumoconiosis. Barium sulfate production, workers should do a good job of protective measures, with labor insurance.

　　3、在生产硫酸钡的时候，应该厂房密闭，防止粉尘污染坏境。

　　3, in the production of barium sulfate, the plant should be closed, to prevent dust pollution.

　　4、应该有伤害,但很小.硫酸钡是难溶物,有毒的钡无法电离,进而较难进入人体,但总有极微量的钡离子,会对人体造成伤害.医院给病人胃造影用的就是硫酸钡的悬浊液,伤害很小。

　　4, there should be hurt, but very small. Barium sulfate is insoluble, toxic and difficult to be ionized barium, into the body, but there is always a trace amount of barium ions, can cause harm to human body. The hospital for patients with gastric angiography is used in barium sulfate suspension injury is very small.

铅板是人类最早使用的金属之一，公元前3000年，人类就从矿石中熔炼铅。铅锌在自然界里特别在原生矿床中共生极为密切。它们具有共同的成矿物质来源和十分相似的地球化学行为，有类似的外层电子结构，都具有强烈的亲硫性，并形成相同的易溶络合物。它们被铁锰质、粘土或有机质吸附的情况也很相近。铅在地壳中平均含量约为15×10-6，锌在地壳中平均含量约为80×10-6。
目前，在地壳中已发现的铅锌矿物约有250多种，大约1/3是硫化物和硫酸盐类，但可供目前工业利用的仅有17种。其中，铅工业矿物有方铅矿、硫锑铅矿、脆硫锑铅矿、车轮矿、白铅矿、铅矾、铬铅矿、磷氯铅矿、砷铅矿、钒铅矿、钼铅矿；锌工业矿物有闪锌矿、纤维锌矿、菱锌矿、异极矿、硅锌矿、水锌矿。方铅矿、闪锌矿等是冶炼铅锌的主要工业矿物原料。
主要用于制造铅蓄电池，在制酸工业和冶金工业上用铅板、铅管作衬里保护设备，电气工业中铅用作电缆包皮和熔断保险丝。含锡、锑的铅合金用作印刷活字，铅锡合金用于制造易熔铅焊条，铅板和镀铅钢板用于建筑工业。铅对X射线和γ射线有良好的吸收性，广泛用作X光机和原子能装置的保护材料。由于铅毒和经济等原因，某些领域中铅已经或即将被其他材料所代替。