Study on Determination Method of Total Potassium in Flue-cured Tobacco

doi:10.11924/j.issn.1000-6850.casb19020010

Abstract

Abstract:

The H₂SO₄-H₂O₂ heating digestion method is the standard method for the determination of total potassium in flue-cured tobacco. This method is cumbersome to operate and has potential security risks. To improve the detection efficiency, the effects of the concentration, volume and time of hydrochloric acid (HCl) and acetic acid (CH₃COOH) on the potassium extraction were investigated. The results showed that 30 mL 0.5 mol/L HCl shaking for 30 min and 30 mL 1 mol/L CH₃COOH for 40 min at room temperature (20-25℃) had considerably higher accuracy and recovery rate. The t-test showed that the results of the two extraction methods and the standard method had no obvious difference. The HCl extraction method was superior to the CH₃COOH extraction method in terms of concentration and extraction time.

Key words: flue-cured tobacco, potassium, HCl, CH₃COOH

CLC Number:

O614.113

Liu Zhiqiang, Zhao Zhengxiong. Study on Determination Method of Total Potassium in Flue-cured Tobacco[J]. Chinese Agricultural Science Bulletin, 2020, 36(15): 147-151.

Figures/Tables 7

References 20

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部位	浓度/(mol/L)				用量/mL				浸提时间/min
部位	0.1	0.5	1	2	10	20	30	40	20	30	40	60
上部叶	3.88	4.21	4.20	4.18	3.79	4.11	4.21	4.18	4.07	4.23	4.22	4.20
中部叶	4.22	4.59	4.59	4.58	4.09	4.44	4.58	4.57	4.38	4.59	4.58	4.60
下部叶	4.57	4.97	4.97	4.95	4.50	4.82	4.97	4.95	4.79	4.99	4.98	4.96
茎	3.35	3.77	3.77	3.75	3.42	3.66	3.78	3.76	3.62	3.79	3.78	3.76
根	2.33	2.64	2.64	2.62	2.28	2.52	2.64	2.61	2.49	2.66	2.64	2.62

部位	浓度/(mol/L)				用量/mL				浸提时间/min
部位	0.1	0.5	1	2	10	20	30	40	20	30	40	60
上部叶	3.88	4.21	4.20	4.18	3.79	4.11	4.21	4.18	4.07	4.23	4.22	4.20
中部叶	4.22	4.59	4.59	4.58	4.09	4.44	4.58	4.57	4.38	4.59	4.58	4.60
下部叶	4.57	4.97	4.97	4.95	4.50	4.82	4.97	4.95	4.79	4.99	4.98	4.96
茎	3.35	3.77	3.77	3.75	3.42	3.66	3.78	3.76	3.62	3.79	3.78	3.76
根	2.33	2.64	2.64	2.62	2.28	2.52	2.64	2.61	2.49	2.66	2.64	2.62

部位	浓度				用量				浸提时间
部位	0.1 mol/L	0.5 mol/L	1 mol/L	2 mol/L	10 mL	20 mL	30 mL	40 mL	20 min	30 min	40 min	60 min
上部叶	3.48	3.81	4.20	4.21	3.62	3.92	4.21	4.20	3.72	4.08	4.22	4.23
中部叶	3.95	4.26	4.59	4.58	3.90	4.30	4.60	4.60	4.07	4.42	4.60	4.61
下部叶	4.30	4.60	4.98	4.98	4.35	4.64	4.97	4.99	4.40	4.83	4.99	4.99
茎	3.30	3.52	3.76	3.78	3.31	3.54	3.78	3.79	3.37	3.64	3.79	3.78
根	2.25	2.43	2.66	2.66	2.18	2.40	2.67	2.65	2.27	2.52	2.65	2.66

部位	浓度				用量				浸提时间
部位	0.1 mol/L	0.5 mol/L	1 mol/L	2 mol/L	10 mL	20 mL	30 mL	40 mL	20 min	30 min	40 min	60 min
上部叶	3.48	3.81	4.20	4.21	3.62	3.92	4.21	4.20	3.72	4.08	4.22	4.23
中部叶	3.95	4.26	4.59	4.58	3.90	4.30	4.60	4.60	4.07	4.42	4.60	4.61
下部叶	4.30	4.60	4.98	4.98	4.35	4.64	4.97	4.99	4.40	4.83	4.99	4.99
茎	3.30	3.52	3.76	3.78	3.31	3.54	3.78	3.79	3.37	3.64	3.79	3.78
根	2.25	2.43	2.66	2.66	2.18	2.40	2.67	2.65	2.27	2.52	2.65	2.66

部位	平行测定值/%						平均值/%	标准差	变异系数/%
上部叶	4.20	4.22	4.19	4.18	4.17	4.19	4.19	0.02	0.38
中部叶	4.59	4.58	4.62	4.57	4.64	4.61	4.60	0.02	0.52
下部叶	4.97	4.95	5.00	4.96	5.02	4.99	4.98	0.02	0.48
茎	3.77	3.78	3.76	3.80	3.74	3.82	3.78	0.03	0.69
根	2.64	2.67	2.63	2.61	2.68	2.66	2.65	0.02	0.91