Direct Titration of Sulfate

Schroeder, W. C.

doi:10.1021/ac50086a016

Cited by 42 publications

(16 citation statements)

References 66 publications

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“…In comparison with certain other similar methods recently suggested for the direct titration of sulfate, the method is similar in principle to that of Schroeder (titration with barium chloride, with tetrahydroxyquinone as internal indicator, 16) and to that of Strebinger and Zombory (an indirect method using sodium rhodizonate as indicator, 17). Schroeder's method applies to quantities of 2 to 20 mg. of sulfate, while the eosin-lead nitrate titration works best for much larger quantities.…”

Section: Discussionmentioning

confidence: 91%

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Determination of Sulfate

Ricci¹

1936

Ind. Eng. Chem. Anal. Ed.

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Section: Discussionmentioning

confidence: 91%

“…Apparently, however, no method has yet been suggested for the direct titration of sulfate with lead salts by means of an adsorption indicator. The reader is referred elsewhere for reviews of the volumetric methods for sulfate, most of which involve the use of barium chloride as standard solution (1,16).…”

Section: Discussionmentioning

confidence: 99%

Determination of Sulfate

Ricci¹

1936

Ind. Eng. Chem. Anal. Ed.

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Section: Discussionmentioning

confidence: 99%

Direct Titration of Sulfates

Sheen¹,

Kähler²

1936

Ind. Eng. Chem. Anal. Ed.

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suggested a direct titration method for sulfates with the use of tetrahydroxyquinone as an ized to the acid side of the phenolphthalein end point. Phosphate was found to be an interfering ion.It was the aim of this investigation to extend the sulfate range, which was found possible, and to find a diluent that could be used in place of ethyl or denatured alcohol, because of the difficulty of obtaining either the ethyl or the denatured alcohol in many plants, owing to certain government restrictions. Isopropyl alcohol was found to answer this purpose. Elimination of the phosphate ion is desirable and it was found that this ion could be eliminated up to 60 p. p. m. by changing the pH value of the titrating solution to about 4.0. ExperimentalThe indicator used throughout this study was manufactured in the Betz laboratory and considerable quantities of this material have been supplied to the field.Detailed directions are given below for a determination of sulfate by direct titration using THQ as the indicator.Materials and Reagents. Standard barium chloride solution, the strength varying from 1 cc. = 1 mg. of SOi to 1 cc. = 50 mg. of SOi, standardized gravimetrically. An indicator composed of disodium tetrahydroxyquinone ground with dried potassium chloride in a 1 to 300 ratio, and passing a 100-mesh screen.Ethyl alcohol or alcohol denatured by formula No. 30 or No. 3-A, or isopropyl alcohol. Phenolphthalein indicator and bromocresol green indicator (if phosphates are present). Sodium chloride crystals, c. p.

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“…Several approaches have already been described for the determination of sulphate. The existing manual methods, for example the standard gravimetric method 2 and the titrimetric methods 3,4 , including potentiometric methods with ion-selective electrodes, which usually involve precipitation titrations with lead(II) solution and a lead-selective electrode [4][5][6][7] , are all cumbersome, tedious and time-consuming, inconvenient for application to environmental studies in which usually large numbers of samples are involved, as well, the methodologies based on chromatography [8][9] where the usable life of an expensive chromatographic column is severally shortened. Methodologies based on flow injection analysis (FIA) have been published for sulphate determination with turbidimetric 10,11 , spectrofluorimetric 12 , atomic absorption 13 or spectrophotometric 14 detection.…”

Section: Introductionmentioning

confidence: 99%

Sequential injection analysis determination of sulphate in wastewaters by ultraviolet-spectrophotometry

Lapa¹,

Lima²,

Pinto³

2000

J. Braz. Chem. Soc.

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Foi desenvolvido um sistema de análise por injeção sequencial, baseado na formação do cátion FeSO 4 + e detecção espectrofotométrica a 355 nm, para a determinação de sulfato em águas residuais. Os principais interferentes foram avaliados. O sistema proposto é totalmente automático e permite o monitoramento de sulfato em amostras. O desvio padrão relativo (RSD) obtido foi inferior a 2,4%. O sistema apresentou uma resposta linear entre 10 e 1000 mg L -1 . A velocidade de amostragem obtida foi de 72 amostras por h.A sequential injection analysis system based on the formation of the cation FeSO 4 + and the spectrophotometric measuring of the absorbance at 355 nm has been developed for the determination of sulphate in wastewaters. The main interferents were also evaluated. The proposed system is fully automatized and is able to monitor sulphate in samples. The relative standard deviation (RSD) obtained was smaller than 2.4%. The linearity of response was obtained between 10 and 1000 mg L -1 . The sampling rate was 72 samples per hour.

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Direct Titration of Sulfate

Cited by 42 publications

References 66 publications

Determination of Sulfate

Determination of Sulfate

Direct Titration of Sulfates

Sequential injection analysis determination of sulphate in wastewaters by ultraviolet-spectrophotometry

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