protosaltn.

Brit.

/ˈprəʊtə(ʊ)sɔːlt/,

/ˈprəʊtə(ʊ)sɒlt/, U.S.

/ˈproʊdəˌsɔlt/,

/ˈproʊdəˌsɑlt/

Origin: Formed within English, by compounding. Etymons: proto- comb. form, salt n.¹

Etymology: < proto- comb. form + salt n.¹ Compare persalt n.

Chemistry. Now rare.

A salt in which the anion occurs in the smallest possible proportion relative to the metal cation (i.e. in which the metal occurs in its lowest oxidation state). Cf. persalt n.

ΚΠ

1822 M. Faraday in Q. Jrnl. Sci. & Arts July 316 The per salts give it [sc. rhubarb paper] an olive-green tint, whilst the proto salts produce no change.

1836–41 W. T. Brande Man. Chem. (ed. 5) 592 The protosalts of iron are..preferable to those of tin, inasmuch as the resulting peroxide of iron is retained in solution, and the precepitated metal is pure.

1869 H. E. Roscoe Lessons Elem. Chem. (new ed.) xxii. 223 The ferrous- or proto-salts are distinguished by their light green colour.

1914 Proc. Royal Soc. B. 88 307 Where boiling removes the direct oxidase action of an extract but this returns slowly after cooling, this may be due to the conversion of a ‘per’ salt into a ‘proto’ salt or vice versa.

2005 Chem. Geol. 215 413/1 Following rain, globular masses of wet ‘protosalts’ are observed on scrap wood, twigs, and leaf litter, as well as along the walls of erosion gullies.

This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	protosalt
释义	protosaltn. Brit. /ˈprəʊtə(ʊ)sɔːlt/, /ˈprəʊtə(ʊ)sɒlt/, U.S. /ˈproʊdəˌsɔlt/, /ˈproʊdəˌsɑlt/ Origin: Formed within English, by compounding. Etymons: proto- comb. form, salt n.¹ Etymology: < proto- comb. form + salt n.¹ Compare persalt n. Chemistry. Now rare. A salt in which the anion occurs in the smallest possible proportion relative to the metal cation (i.e. in which the metal occurs in its lowest oxidation state). Cf. persalt n. ΚΠ 1822 M. Faraday in Q. Jrnl. Sci. & Arts July 316 The per salts give it [sc. rhubarb paper] an olive-green tint, whilst the proto salts produce no change. 1836–41 W. T. Brande Man. Chem. (ed. 5) 592 The protosalts of iron are..preferable to those of tin, inasmuch as the resulting peroxide of iron is retained in solution, and the precepitated metal is pure. 1869 H. E. Roscoe Lessons Elem. Chem. (new ed.) xxii. 223 The ferrous- or proto-salts are distinguished by their light green colour. 1914 Proc. Royal Soc. B. 88 307 Where boiling removes the direct oxidase action of an extract but this returns slowly after cooling, this may be due to the conversion of a ‘per’ salt into a ‘proto’ salt or vice versa. 2005 Chem. Geol. 215 413/1 Following rain, globular masses of wet ‘protosalts’ are observed on scrap wood, twigs, and leaf litter, as well as along the walls of erosion gullies. This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1822
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