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一九七四年在我国陕西省临潼发掘出的秦始皇陶俑坑气势磅礴,著称于世。所出土的大批珍贵文物为研究我国古代政治、军事、科技与生产提供了可靠的证据。据报导在一号坑与二号坑两个坑出土的铜器上万件,而铜镞就有8400件之多,其中具有黑色表面的铜镞不仅外形有别,而且有的表面乌黑而光亮,似经过抛光处理的;有的表面黑而并不光亮,似未经抛光处理。检测其中一枚具有乌黑而光亮的铜镞表面发现含有铬。铬是现代生活中的常见元素,在化合物中它的稳定氧化数是+3、+6,氧化数为+4的化合物近20—30年来仅以
The monument of Qin Shihuang Terracotta Warriors, excavated in Lintong, Shaanxi Province, China, in 1974, is world-famous. The large number of precious cultural relics excavated provide reliable evidence for studying the ancient politics, military affairs, science and technology and production in our country. It is reported that there are over 10,000 pieces of bronze unearthed in Pit No.1 and Pit No.2. There are as many as 8,400 pieces of copper bracelets, of which the black copper tin with black surface is not only in appearance but also dark in appearance , Seems to be polished; some surface is not black and shiny, it seems not polished. Detection of one of the black and shiny copper 镞 surface is found to contain chromium. Chromium is a common element in modern life. Its stable oxidation number is + 3, + 6, and its oxidation number is + 4 in the compound in the past 20 to 30 years