@article{ greenhalgh_determination_1961,
  title = {The determination of fluorides in natural waters, with particular reference to sea water.},
  volume = {25},
  abstract = {To det. F- in sea water, add 8 ml. of the combined La alizarin complexone (I) reagent to 15 ml. filtered sea water; to samples contg. {\textless}20% Cl- add (0.4-0.02x) ml. 6N {HOAc} (where x = % Cl- of the water), dil. to 25 ml., and measure the absorbance of the soln. ({pH} 4.50 ± 0.02) at 622 {mÎ}¼ vs. the reagent blank (8 ml. I + 17 ml. distd. H2O contg. 0.4 ml. 6N {HOAc}) after 0.5 hr. For waters contg. 15-20% Cl-, multiply the absorbance by 1.040 to correct for salt error. Calibrate the method in the same manner by using 15 ml. vols. of distd. H2O contg. 1, 1.5, and 2 ml. standard {NaF} soln. (10 γ F-/ml.). Beer's law holds in the 0-25 γ F-/25 ml. concn. range. Prep. I reagent, dissolving 0.0479 g. alizarin complexone (1,2-di-hydroxy-3-anthraquinonyl methylamine-N,N-diacetic acid) in 0.1 ml. concd. aq. {NH}3 + 1 ml. 20% (wt./vol.) {NH}4OAc + 2-3 ml. distd. H2O, filter into an aq. soln. of 8.2 g. anhyd. {NaOAc} + 6 ml. {HOAc}, add 100 ml. Me2CO slowly, add {LaCl}3 soln. (from 0.0408 g. La2O3 + 2.5 ml. 2M {HCl}), and dil. to 200 ml. with H2O. Al+++ (≥2 p.p.m.) and Fe+++ interfere seriously in the detn., forming stable {AlF}6— and {FeF}6— compds. To det. F- in fresh nonsaline waters, sep. Al+++ and Fe+++ by extg. a 20-ml. sample + 2 ml. 2M {NaOAc} + 0.45 ml. 6N {HOAc} and 1 ml. 20% 8-quino-linol in Me2CO in a continuous extn. app. ({CA} 53, 21451b) with {CHCl}3. F- is detd. as above by using 20-50-ml. aliquots of extd. water. Me2CO in I increases the sensitivity of the method to 0.0018 γ/ml. F-. Replicate detns. (11) on a sea water by the method gave an av. of 1.371 γ/ml. F- with a coeff. of variation of 0.28%. [on {SciFinder}(R)]},
  journal = {Analitica Chimica Acta},
  author = {Greenhalgh, R. and Riley, J. P.},
  year = {1961},
  pages = {179--88}
}

{"_id":"xkSuaH3Qw74Wosivd","authorIDs":[],"author_short":["Greenhalgh, R.","Riley, J.<nbsp>P."],"bibbaseid":"greenhalgh-riley-thedeterminationoffluoridesinnaturalwaterswithparticularreferencetoseawater-1961","bibdata":{"abstract":"To det. F- in sea water, add 8 ml. of the combined La alizarin complexone (I) reagent to 15 ml. filtered sea water; to samples contg. \\textless20% Cl- add (0.4-0.02x) ml. 6N HOAc (where x = % Cl- of the water), dil. to 25 ml., and measure the absorbance of the soln. (pH 4.50 ± 0.02) at 622 mμ vs. the reagent blank (8 ml. I + 17 ml. distd. H2O contg. 0.4 ml. 6N HOAc) after 0.5 hr. For waters contg. 15-20% Cl-, multiply the absorbance by 1.040 to correct for salt error. Calibrate the method in the same manner by using 15 ml. vols. of distd. H2O contg. 1, 1.5, and 2 ml. standard NaF soln. (10 γ F-/ml.). Beer's law holds in the 0-25 γ F-/25 ml. concn. range. Prep. I reagent, dissolving 0.0479 g. alizarin complexone (1,2-di-hydroxy-3-anthraquinonyl methylamine-N,N-diacetic acid) in 0.1 ml. concd. aq. NH3 + 1 ml. 20% (wt./vol.) NH4OAc + 2-3 ml. distd. H2O, filter into an aq. soln. of 8.2 g. anhyd. NaOAc + 6 ml. HOAc, add 100 ml. Me2CO slowly, add LaCl3 soln. (from 0.0408 g. La2O3 + 2.5 ml. 2M HCl), and dil. to 200 ml. with H2O. Al+++ (≥2 p.p.m.) and Fe+++ interfere seriously in the detn., forming stable AlF6— and FeF6— compds. To det. F- in fresh nonsaline waters, sep. Al+++ and Fe+++ by extg. a 20-ml. sample + 2 ml. 2M NaOAc + 0.45 ml. 6N HOAc and 1 ml. 20% 8-quino-linol in Me2CO in a continuous extn. app. (CA 53, 21451b) with CHCl3. F- is detd. as above by using 20-50-ml. aliquots of extd. water. Me2CO in I increases the sensitivity of the method to 0.0018 γ/ml. F-. Replicate detns. (11) on a sea water by the method gave an av. of 1.371 γ/ml. F- with a coeff. of variation of 0.28%. [on SciFinder(R)]","author":["Greenhalgh, R.","Riley, J. P."],"author_short":["Greenhalgh, R.","Riley, J.<nbsp>P."],"bibtex":"@article{ greenhalgh_determination_1961,\n title = {The determination of fluorides in natural waters, with particular reference to sea water.},\n volume = {25},\n abstract = {To det. F- in sea water, add 8 ml. of the combined La alizarin complexone (I) reagent to 15 ml. filtered sea water; to samples contg. {\\textless}20% Cl- add (0.4-0.02x) ml. 6N {HOAc} (where x = % Cl- of the water), dil. to 25 ml., and measure the absorbance of the soln. ({pH} 4.50 ± 0.02) at 622 {mÎ}¼ vs. the reagent blank (8 ml. I + 17 ml. distd. H2O contg. 0.4 ml. 6N {HOAc}) after 0.5 hr. For waters contg. 15-20% Cl-, multiply the absorbance by 1.040 to correct for salt error. Calibrate the method in the same manner by using 15 ml. vols. of distd. H2O contg. 1, 1.5, and 2 ml. standard {NaF} soln. (10 γ F-/ml.). Beer's law holds in the 0-25 γ F-/25 ml. concn. range. Prep. I reagent, dissolving 0.0479 g. alizarin complexone (1,2-di-hydroxy-3-anthraquinonyl methylamine-N,N-diacetic acid) in 0.1 ml. concd. aq. {NH}3 + 1 ml. 20% (wt./vol.) {NH}4OAc + 2-3 ml. distd. H2O, filter into an aq. soln. of 8.2 g. anhyd. {NaOAc} + 6 ml. {HOAc}, add 100 ml. Me2CO slowly, add {LaCl}3 soln. (from 0.0408 g. La2O3 + 2.5 ml. 2M {HCl}), and dil. to 200 ml. with H2O. Al+++ (≥2 p.p.m.) and Fe+++ interfere seriously in the detn., forming stable {AlF}6— and {FeF}6— compds. To det. F- in fresh nonsaline waters, sep. Al+++ and Fe+++ by extg. a 20-ml. sample + 2 ml. 2M {NaOAc} + 0.45 ml. 6N {HOAc} and 1 ml. 20% 8-quino-linol in Me2CO in a continuous extn. app. ({CA} 53, 21451b) with {CHCl}3. F- is detd. as above by using 20-50-ml. aliquots of extd. water. Me2CO in I increases the sensitivity of the method to 0.0018 γ/ml. F-. Replicate detns. (11) on a sea water by the method gave an av. of 1.371 γ/ml. F- with a coeff. of variation of 0.28%. [on {SciFinder}(R)]},\n journal = {Analitica Chimica Acta},\n author = {Greenhalgh, R. and Riley, J. P.},\n year = {1961},\n pages = {179--88}\n}","bibtype":"article","id":"greenhalgh_determination_1961","journal":"Analitica Chimica Acta","key":"greenhalgh_determination_1961","pages":"179--88","title":"The determination of fluorides in natural waters, with particular reference to sea water.","type":"article","volume":"25","year":"1961","bibbaseid":"greenhalgh-riley-thedeterminationoffluoridesinnaturalwaterswithparticularreferencetoseawater-1961","role":"author","urls":{},"downloads":0,"html":""},"bibtype":"article","biburl":"http://bibbase.org/zotero/qapfecul","creationDate":"2015-01-18T19:17:04.543Z","downloads":0,"keywords":[],"search_terms":["determination","fluorides","natural","waters","particular","reference","sea","water","greenhalgh","riley"],"title":"The determination of fluorides in natural waters, with particular reference to sea water.","year":1961,"dataSources":["4dv8khYrc4qmNtkop"]}