18 Melting Point (MP) (Celcius) References
18_1 Values were taken from http://www.epa.gov/opptintr/exposure/pubs/episuite.htm.
MPBPWIN, from Syracuse Research Corporation, retrieves melting point values
from a database containing reliably measured values. When a structure matches
a database structure (via an exact atom-to-atom connection match), the melting
point experimental value is retrieved. If no experimental value is availbale,
an estimated values is generated. Used for organic compounds only.
18_2 Values were taken from CRC Handbook of Chemistry and Physics, 85th ed., 2004-2005. Section 4. Properties of the Elements and Inorganic Compounds. Table of "Physical constants of inorganic compounds", pp. 4-37 to 4-96.
18_3 Decomposes at this temperature. See Reference 18_2.
18_4 Lange's Handbook of Chemistry (15th Edition), Edited by: Dean, J.A., McGraw-Hill, 1999. Table 3.2 Physical Constants of Inorganic Compounds., p.3.2.
18_5 Decomposes under standard conditions. See Reference 18_2.
18_6 Perry's Chemical Engineers' Handbook (7th Edition), Edited by: Perry, R.H.; Green, D.W., McGraw-Hill, 1997. Table 2-1. Physical Properties of the Elements and Inorganic Compounds.
18_7 "Chemical Properties Handbook", 2001, C.L. Yaws [ed], McGraw-Hill. Table of "Critical Properties and Acentric Factor; Inorganic Compounds".
18_8 Antimony trioxide transitions from the senarmontite crystalline form to the valentinite form at 570 degrees Celsius, which then melts at 655 degrees Celsius.
18_9 Values reported here are for arsenic (tri)sulfide (CAS 1303-33-9). Although varied, the most prevalent form of arsenic in the environment is that of arsenic sulfide. However, a mixture of trivalent and pentavalent arsenic salts is found in the environment due to natural deposition and anthropogenic activity. [ATSDR Toxicological Profile for Arsenic, 2000].
18_10 Triple point for inorganic (gray) arsenic at 3.70 MPa. The triple point indicates the temperature at which solid, liquid, and gas are in equilibrium at a pressure greater than one atmosphere (i.e., the normal melting point does not exist).
18_11 Values reported here are for elemental boron. Borate, more specifically boric acid (CAS 10043-35-3) has a melting point of 170.9 degrees Celsius.
18_12 Values reported here are for chromium (III) oxide (CAS 1308-38-9) which is one of the water insoluble salts. The other insoluble chromium (III) salts include chromium (III) hydroxide (CAS 1308-14-1) and chromium (III) phosphate (CAS 7789-04-0).
18_13 Values reported here are for chromium (VI) oxide (CAS 1333-82-0) which is soluble in water releasing the hexavalent chromium ion (CAS 18540-29-9).
18_14 Triple point. The triple point indicates the temperature at which solid, liquid, and gas are in equilibrium at a pressure greater than one atmosphere (i.e., the normal melting point does not exist).
18_15 Values reported here are for metallic nickel (CAS 7440-02-0) which is insoluble in water. Typical soluble salts include nickel chloride (CAS 7718-54-9), nickel perchlorate (CAS 13637-71-3, as given in CRC), nickel iodide (CAS 13462-90-3), nickel nitrate (CAS 13138-45-9), and nickel sulfate (CAS 7786-81-4), with varying melting points and boiling points that are, however, below that of metallic nickel.
18_16 Values reported here are for nitric acid (CAS 7697-37-2) as source of the dissolved salt ionic form of nitrate.
18_17 Nitrogen dioxide reacts under standard conditions to form nitrogen tetroxide (CAS 10544-72-6). Melting and boiling point values are for nitrogen tetroxide.
18_18 Values reported here are for selenium (tri-)sulfide [SeS3] (CAS 75926-30-6, as given in CRC) or the [Se2S6] selenium (tri-)sulfide dimeric form (CAS 75926-26-0, as given in CRC). Selenium (mono-)sulfide [SeS] (CAS 7446-34-6) or its tetrameric form [Se4S4] (CAS 75926-28-2, as given in CRC) decomposes at 113 degrees Celsius. Selenium (di-)sulfide (CAS 7488-56-4), selenium (mono-)sulfide, and selenium (tri-)sulfide exist in mixtures of varying composition in chemical preparations. [ATSDR Toxicological Profile for Selenium, 2003].
18_19 Values reported here are for sulfuric acid (CAS 7664-93-9) as source of the dissolved salt ionic form of sulfate.
18_20 Values reported here are for metallic thallium (CAS 7440-28-0) which is insoluble in water. Soluble salts for thallium include thallium chlorate (CAS 13453-30-0), thallium carbonate (CAS 6533-73-9), thallium fluoride (CAS 7789-27-7), thallium nitrate (CAS 10102-45-1), and thallium sulfate (CAS 7446-18-6), with varying melting and boiling points that are, however, below that of metallic thallium.
18_21 Values reported here are for metallic uranium (CAS 7440-61-1). Soluble salts for uranium include uranium chloride (CAS 10025-93-1), uranium fluoride (CAS 13775-07-0), and uranium iodide (CAS 13470-22-9, as given in CRC), with varying melting points and boiling points that are, however, below that of metallic uranium.
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