Adsorption-desorption characteristics of ammonium polyphosphate in purple soils

doi:10.3969/j.issn.1004-1524.2023.02.18

Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (2): 403-416.DOI: 10.3969/j.issn.1004-1524.2023.02.18

• Environmental Science • Previous Articles Next Articles

Adsorption-desorption characteristics of ammonium polyphosphate in purple soils

YUAN Taiyan¹(), YAN Zhengjuan¹^,^*(), HUANG Chengdong², ZHANG Zhiye¹, WANG Xinlong¹

1. Engineering Research Center of Comprehensive Utilization and Clean Processing of Phosphorus Resources of Ministry of Education, School of Chemical Engineering, Sichuan University, Chengdu 610065, China
2. National Institute of Agricultural Green Development, Ministry of Education Key Laboratory of Plant-Soil Interaction, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China

Received:2022-01-29 Online:2023-02-25 Published:2023-03-14
Contact: YAN Zhengjuan

Abstract

Abstract:

Ammonium polyphosphate (APP) of APP1 (low polymerization degree) and APP2 (high polymerization degree) were used as the research objects. Based on the adsorption-desorption test, the adsorption and desorption characteristics of APP in typical acid and calcareous purple soils were investigated by using isothermal equation model, combined with the analysis of phosphorus (P) forms in the equilibrium solution in comparison with monoammonium phosphate (MAP), in order to provide theoretical basis for efficient utilization of APP in purple soils. The results showed that with the increase of P addition (1-300 mg·L^-1), the adsorption of APP by acid purple soil increased first and then decreased, while always increased by calcareous purple soil. When the P addition was 1-100 mg·L^-1, the adsorption of APP1 and APP2 by acid purple soil better fitted the Langmuir equation (R²=0.961) and Freundlich equation (R²=0.947), respectively, while the adsorption of APP by calcareous purple soil fitted the Freundlich equation (R² of 0.995, 0.950, respectively). Two purple soils dominantly absorbed the polyphosphate (poly-P) in the APPs, especially for pyrophosphate (pyro-P), and the contribution rate of pyro-P in the APP1 and APP2 to P adsorption exceeded 76% and 36%, respectively. Under higher P addition, the negative adsorption phenomenon occurred for the adsorption of orthophosphate (ortho-P) in the APP by acid purple soil. Meanwhile, in the two purple soils, the desorption rate of ortho-P in the APP was higher than that of poly-P, and the desorption rate of ortho-P in acid purple soil with high adsorbed P even exceeded 100%. Under low P addition, the adsorption amount of APP was higher than that of MAP by two purple soils. APP increased the contents of Fe, Al and dissolved organic carbon, while reduced the content of Ca in the adsorption equilibrium solutions. In conclusion, APP with various P forms maintained ortho-P supply via promoting the ortho-P release from the soil, but not via reducing its adsorption by the soil. In addition, the distribution of P forms in the APP also determined its availability in the soil.

Key words: purple soil, ammonium polyphosphate, adsorption, desorption, phosphorus forms

CLC Number:

S143.2

YUAN Taiyan, YAN Zhengjuan, HUANG Chengdong, ZHANG Zhiye, WANG Xinlong. Adsorption-desorption characteristics of ammonium polyphosphate in purple soils[J]. Acta Agriculturae Zhejiangensis, 2023, 35(2): 403-416.

Figures/Tables 13

Table 1 Properties of soils used in experiment

指标 Index	酸性紫色土壤 Acid purple soil	石灰性紫色土壤 Calcareous purple soil
pH	4.36	8.05
CaCO₃/(g·kg^-1)	—	39.08
有机质	4.49	8.73
Organic matter/(g·kg^-1)
全磷Total P/(g·kg^-1)	0.46	0.85
全氮Total N/(g·kg^-1)	0.48	0.86
有效磷Olsen-P/(mg·kg^-1)	85.4	7.2
黏粒	37.2	196.8
Clay/(<0.002 mm,g·kg^-1)
游离态铁氧化物	1.95	4.63
Free Fe oxides/(g·kg^-1)
游离态铝氧化物	4.22	2.54
Free Al oxides /(g·kg^-1)
无定型铁氧化物	0.11	0.11
Amorphous Fe oxides/(g·kg^-1)
无定型铝氧化物	0.12	0.12
Amorphous Al oxides/(g·kg^-1)

Table 2 Molecular weight, pH and mass fraction distribution of different P forms used in experiment

磷源 P source	分子量 Molecular weight	pH	磷形态分布Mass fraction distribution of P forms/%
磷源 P source	分子量 Molecular weight	pH	P1	P2	P3	P4	P5	P6	P7
MAP	115.0	5.4	100.00	—	—	—	—	—	—
APP1	168.3	6.5	41.99	58.01	—	—	—	—	—
APP2	272.6	7.0	23.59	30.14	22.23	12.87	6.57	2.86	1.75

Fig.1 Adsorption isotherm of total P of different P sources in acid purple soil (A) and calcareous purple soil (B)

Fig.2 Adsorption rate of total P of different P sources by acid purple soil (A) and calcareous purple soil (B)

Table 3 Fitting result of P (1-100 mg··L-1) sorption of soils under different phosphorus sources by Langmuir and Freundlich equations

土壤 Soil	磷源 P source	Langmuir方程参数 Parameters of Langmuir equation					Freundlich方程参数 Parameters of Freundlich equation
土壤 Soil	磷源 P source	S_max	K_L	R²	DPS	PBC	K_F	n	R²
酸性紫色土壤	MAP	337	0.069	0.860	20.24	23.22	47.66	0.395	0.986
Acid purple soil	APP1	499	0.104	0.961	14.63	51.95	61.89	0.499	0.872
	APP2	532	0.079	0.891	13.84	42.26	72.99	0.423	0.947
石灰性紫色土壤	MAP	494	0.069	0.831	1.437	34.25	91.87	0.289	0.922
Calcareous purple soil	APP1	2664	0.032	0.680	—	84.55	94.82	0.749	0.995
	APP2	3507	0.023	0.213	—	81.05	112.84	0.693	0.950

Fig.3 Contribution of different forms of P in ammonium polyphosphate (APP) to P adsorption in purple soil Ortho-P, n=1; Poly-P, n≥2. The same as below.A, APP1, acid purple soil; B, APP2, acid purple soil; C, APP1, calcareous purple soil; D, APP2, calcareous purple soil.

Fig.4 P fate at adsorption equilibrium of ammonium polyphosphate (APP) in purple soil A, APP1, acid purple soil; B, APP2, acid purple soil; C, APP1, calcareous purple soil; D, APP2, calcareous purple soil. a, Before adsorption; b, After adsorption. P1, Orthophosphate; P2, Pyrophosphate; P3, Tripolyphosphate; P4, Tetraphosphate; P5, Pentaphosphate; P6, Hexaphosphate; P7, Heptaphosphate.

Fig.5 Effects of different P sources on pH of adsorption equilibration of acid purple soil (A) and calcareous purple soil (B) Bars marked without the same letters indicated significant difference at P<0.05 under the same P addition amount. The same as below.

Fig.6 Concentrations of Ca (A, B), Fe (C, D) and Al (E, F) in adsorption equilibration solutions of acid purple soil (A, C, E) and calcareous purple soil (B, D, F) with different P sources

Fig.7 Concentrations of dissolved organic carbon (DOC) in adsorption equilibration solutions of acid purple soil (A) and calcareous purple soil (B) with different P sources

Fig.8 Desorption isotherms of total P on acid purple soil (A) and calcareous purple soil (B) of total P in different soils with different P sources

Fig.9 Desorption amount (A, B) and rate (C, D) of different forms of P in APP1 (A, C) and APP2 (B, D) in acid purple soil

Fig.10 Desorption amount (A, B) and rate (C, D) of different forms of P in APP1 (A, C) and APP2 (B, D) in calcareous purple soil

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Adsorption-desorption characteristics of ammonium polyphosphate in purple soils

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