OMNIS奥秘一代和Titrando电位滴定仪对混合酸和TMAH的直接比较
AN-T-234
2023-01
zh
Comparative titration with OMNIS Titrator and 888 Titrando
本应用说明比较了OMNIS奥秘一代自动电位滴定仪和888 Titrando电位滴定仪在铝蚀刻槽中的硝酸、磷酸和醋酸的测定，以及四甲基氢氧化铵（TMAH）的测定。使用了相同的分析参数，表明OMNIS奥秘一代电位滴定仪的结果与其他成熟的滴定系统相当，甚至更好。
Ever since its introduction, the OMNIS platform has been compared to other high-quality Metrohm devices and software. Understandably, OMNIS has had to demonstrate its superior performance over these established systems. One satisfied customer from Taiwan did exactly that and found that the results obtained with OMNIS are even more accurate than with the well-proven Titrando system.
The OMNIS buret with a 100,000 step resolution is superior to the Titrando, with a resolution of either 20,000 steps (Exchange unit) or 10,000 steps (Dosing unit). Furthermore, improved performance of the dTrodes with faster signal transfer and reduced signal noise ensures better results than when using analog electrodes.
This Application Note highlights customer-provided results of determinations of nitric acid, phosphoric acid, and acetic acid in an aluminum etching bath, as well as the determination of tetramethylammonium hydroxide (TMAH). Comparisons were made by using an OMNIS Titrator and an 888 Titrando with identical analysis parameters.
This application is demonstrated on aluminum etching bath and tetramethylammonium hydroxide (TMAH) samples. The sample preparation is subject to a confidentiality agreement with the customer.
The determinations are carried out on an OMNIS Professional Titrator equipped with a dEcotrode Plus (Figure 1) and an 888 Titrando equipped with an Ecotrode Plus. All selected parameters were identical.
The precise determination, the exact parameters, the chemicals used, and the titrant are subject to customer confidentiality.
A summary of results for the comparison of OMNIS and Titrando for aluminum etching bath samples is shown in Table 1. The full results for each set of determinations are displayed in Tables 2–4.
Table 1. Overview of the results of nitric, phosphoric, and acetic acid determination in aluminum etching bath samples with an OMNIS Titrator and an 888 Titrando.
| Device | HNO3 (%) | H3PO4 (%) | HAc (%) |
|---|---|---|---|
OMNIS
SD(rel) |
4.89 | 70.16 | 9.78 |
| 0.37 | 0.06 |
0.70 | |
Titrando
SD(rel) |
4.97 | 70.07 | 9.73 |
| 0.28 | 0.14 |
1.56 |
Table 2. Results of nitric, phosphoric, and acetic acid determination in aluminum etching bath samples on different days with an 888 Titrando.
| Day | HNO3 (%) | H3PO4 (%) | HAc (%) |
|---|---|---|---|
| 1 | 4.96 | 69.99 | 9.86 |
| 4.97 | 69.94 | 9.99 | |
| 2 | 4.96 | 70.15 | 9.69 |
| 4.96 | 70.14 | 9.67 | |
| 3 | 4.97 | 70.14 | 9.66 |
| 4.98 | 70.21 | 9.52 | |
| 4 | 4.97 | 70.10 | 9.64 |
| 4.95 | 69.99 | 9.80 | |
| 5 | 5.00 | 70.13 | 9.59 |
| 4.97 | 69.92 | 9.92 | |
| Mean | 4.97 | 70.07 | 9.73 |
| SD(abs) | 0.01 | 0.10 | 0.15 |
| SD(rel) | 0.28 | 0.14 | 1.56 |
Table 3. Results of nitric, phosphoric, and acetic acid determination in aluminum etching bath samples on different days with an OMNIS Titrator.
| Day | HNO3 (%) | H3PO4 (%) | HAc (%) |
|---|---|---|---|
| 1 | 4.87 | 70.13 | 9.87 |
| 4.87 | 70.12 | 9.84 | |
| 2 | 4.88 | 70.16 | 9.73 |
| 4.87 | 70.17 | 9.77 | |
| 3 | 4.89 | 70.26 | 9.70 |
| 4.91 | 70.14 | 9.78 | |
| 4 | 4.90 | 70.16 | 9.69 |
| 4.90 | 70.14 | 9.78 | |
| 5 | 4.92 | 70.13 | 9.72 |
| 4.90 | 70.18 | 9.88 | |
| Mean | 4.89 | 70.16 | 9.78 |
| SD(abs) | 0.02 | 0.04 | 0.07 |
| SD(rel) | 0.37 | 0.06 | 0.70 |
Table 4. Results of tetramethylammonium hydroxide (TMAH) determination in β(TMAH) = 2.380% samples on different days with an 888 Titrando and an OMNIS Titrator.
| 888 Titrando | OMNIS Titrator | |
|---|---|---|
| Day | Result (%) | Result (%) |
| 1 | 2.3820 | 2.3788 |
| 2.3814 | 2.3794 | |
| 2.3813 | 2.3786 | |
| 2 | 2.3818 | 2.3785 |
| 2.3810 | 2.3780 | |
| 2.3816 | 2.3781 | |
| 3 | 2.3792 | 2.3776 |
| 2.3799 | 2.3779 | |
| 2.3803 | 2.3780 | |
| Mean | 2.3809 | 2.3783 |
| SD(abs) | 0.0009 | 0.0006 |
| SD(rel) | 0.040 | 0.023 |
In addition to manufacturing high-quality analytical instruments, customer satisfaction is extremely important to Metrohm. The data collected and shared in this Application Note from a satisfied customer in Taiwan clearly shows the outstanding performance of Metrohm titrators.
Aside from improving the precision and speed of the determinations, OMNIS delivers results on par or even better than with other established titration systems.
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