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A Modified Procedure for the Determination of Phosphorus in Detergents

Table of Contents

1. Section 1: Introduction
2. Section 2: Background
3. Section 3: Reagents
4. Section 4: Procedure
5. Section 5: Calculation
6. Section 6: Precision and Accuracy
7. Section 7: Conclusion & Recommendations
8. References
9. Appendix
10. List of Tables and Figures

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Appendix

Table 1: Results of Analyses by Various Procedures
Detergent	Mod. Titrimetric Procedure (% P₂O₅)		Aut. Color. on Titration Solution (% P₂O₅)		ASTM Procedure as written (% P₂O₅)
Detergent	Results	Mean	Results	Mean	Results	Mean
A	3.48	3.33	3.14	3.16	3.56	3.71
	3.48		3.18		3.56
	3.26		3.20		3.71
	3.26		3.20		3.71
	3.22		3.10		3.68
	3.22		3.18		3.68
	3.36		3.14		3.87
	3.36		3.14		3.87
B	4.51	4.52	4.60	4.53	5.10	5.04
	4.51		4.56		5.10
	4.40		4.50		4.94
	4.40		4.50		4.94
	4.61		4.54		5.23
	4.61		4.58		5.23
	4.57		4.54		4.82
	4.57		4.46		4.82
C	4.73	4.59	4.58	4.51	4.74	5.08
	4.73		4.62		4.74
	4.51		4.42		5.32
	4.51		4.46		5.32
	4.62		4.50		5.22
	4.62		4.50		5.22
	4.50		4.46		5.04
	4.50		4.54		5.04
D	3.56	3.70	3.60	3.61	4.21	4.25
	3.56		3.60		4.21
	3.64		3.54		4.42
	3.64		3.66		4.42
	3.80		3.58		3.74
	3.80		3.62		3.74
	3.80		3.62		4.61
	3.80		3.66		4.61
E	4.34	4.39	4.40	4.40	5.12	5.22
	4.34		4.40		5.12
	4.48		4.40		4.86
	4.48		4.40		4.86
	4.38		4.34		5.28
	4.38		4.34		5.28
	4.36		4.44		5.63
	4.36		4.46		5.63
F	3.92	4.02	3.88	3.90	4.11	4.39
	3.92		3.76		4.11
	4.15		3.96		4.61
	4.15		3.86		4.61
	3.95		3.92		4.39
	3.95		3.86		4.39
	4.05		4.00		4.43
	4.05		3.96		4.43
G	3.59	3.70	3.54	3.56	3.95	4.04
	3.59		3.40		3.95
	3.82		3.70		4.19
	3.82		3.60		4.19
	3.72		3.50		4.06
	3.72		3.40		4.06
	3.67		3.74		3.96
	3.67		3.60		3.96
H	4.68	4.71	4.44	4.52	5.08	5.28
	4.68		4.44		5.08
	4.75		4.70		5.44
	4.75		4.60		5.44
	4.70		4.58		5.23
	4.70		4.52		5.23
	4.70		4.44		5.36
	4.70		4.44		5.36
I	4.44	4.43	4.25	4.32	5.05	5.03
	4.44		4.20		5.05
	4.53		4.40		4.87
	4.53		4.44		4.87
	4.61		4.40		5.10
	4.61		4.44		5.10
	4.54		4.25		5.10
	4.54		4.20		5.10
Mean		4.16		4.06		4.67

Figure 1: The pH-titration curves of KH₂PO₄ solution titrated with NaOH solution alone and in the presence of NaCl at three concentrations
Figure 1 - The pH-titration curves of KH2PO4 solution titrated with NaOH solution alone and in the presence of NaCl at three concentrations

Figure 2: Titration curve for detergent A
Figure 2 - Titration curve for detergent A

Figure 3: Titration curve for detergent B
Figure 3 - Titration curve for detergent B

Figure 4: Titration curve for detergent C
Figure 4 - Titration curve for detergent C

Figure 5: Titration curve for detergent D
Figure 5 - Titration curve for detergent D

Figure 6: Titration curve for a phosphate standard solution, analysed by the new procedure
Figure 6 - Titration curve for a phosphate standard solution, analysed by the new procedure

Figure 7: pH variation curve for a phosphate standard solution with NaOH 0.25N solution added in 0.25 ml increments
Figure 7 - pH variation curve for a phosphate standard solution with NaOH 0.25N solution added in 0.25 ml increments

Figure 8: pH variation curve for a detergent E solution with NaOH 0.25N solution added in 0.25 ml increments
Figure 8 - pH variation curve for a detergent E solution with NaOH 0.25N solution added in 0.25 ml increments

Figure 9: Manifold of the automated molybdenum-blue colorimetric method
Figure 9 - Manifold of the automated molybdenum-blue colorimetric method

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Date modified:: 2013-06-17

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A Modified Procedure for the Determination of Phosphorus in Detergents

Appendix