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The following standard solutions are prepared using metals, metal salts or oxides. The acids used were purified by distillation below the boiling point. The solutions are delivered in 250 or 100 ml HDPE bottles. The accuracy of the standards meets the NIST specifications for spectrometric solutions. With each item, we deliver the proof of this and the product's safety data sheet. According to strict standardization regulations, the expiration date of standard solutions is 1 year, but most standard solutions remain stable for much longer. The most frequently used standards can be found in the tables. If you need solutions not listed here, contact our staff.