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This means that 1 gram of sodium chloride contains approximately 393.4 mg of elemental sodium. [94] For example, to find out how much sodium chloride contains 1500 mg of elemental sodium (the value of 1500 mg sodium is the adequate intake (AI) for an adult), we can use the proportion:
In some places, remediation programs exist to reduce the presence of lead when it is found to be high, for example in drinking water. [219] As a more radical solution, entire towns located near former lead mines have been "closed" by the government, and the population resettled elsewhere, as was the case with Picher, Oklahoma, in 2009.
Cobalticyanide paper (Rinnmann's test for Zn) can be used as a chemical indicator for zinc. 4 g of K 3 Co(CN) 6 and 1 g of KClO 3 is dissolved on 100 ml of water. Paper is dipped in the solution and dried at 100 °C. One drop of the sample is dropped onto the dry paper and heated. A green disc indicates the presence of zinc. [71]
Like aluminium, copper is recyclable without any loss of quality, both from raw state and from manufactured products. [45] An estimated 80% of all copper ever mined is still in use today. [ 46 ] In volume, copper is the third most recycled metal after iron and aluminium. [ 47 ]
The bandgap is tunable depending on the ratio of different halides, especially between bromine and iodine. Although the optimum band gap for single junction solar cells is 1.1–1.4 eV (based on the Shockley–Queisser limit), perovskites with a higher band gap may be suitable as the top cell in a tandem heterojunction solar cell. [116] H 2 ...