河南省部分市售农用化肥中溶解性离子浓度及同位素组成  

Dissolved Ion Concentrations and Isotope Values in Agricultural Fertilizer Locally Applied in Henan Province

作　　者：张东[1] 薛天 秦勇 刘运涛[3,4] 陈昊 高振朋 黄兴宇 麻冰涓[1] ZHANG Dong;XUE Tian;QIN Yong;LIU Yun-tao;CHEN Hao;GAO Zhen-peng;HUANG Xing-yu;MA Bing-juan(School of Resource&Environment,Henan Polytechnic University,Jiaozuo 454003,China;College of Food Sciences,Xinyang Agriculture&Forestry University,Xinyang 464000,China;The Fifth Institute of Geo-Exploration,Henan Bureau of Geo-Exploration&Mineral Development,Zhengzhou 450001,China;Henan Province Research Center on Applied Engineering Technology of Hydrogeology,Zhengzhou 450001,China)

机构地区：[1]河南理工大学资源环境学院,焦作454003 [2]信阳农林学院食品学院,信阳464000 [3]河南省地质矿产勘查开发局第五地质勘查院,郑州450001 [4]河南省水文地质应用工程技术研究中心,郑州450001

出　　处：《环境科学》2023年第2期1040-1050,共11页Environmental Science

基　　金：国家自然科学基金项目(42073009,41573095);河南省地质矿产勘查开发局青年科技创新项目(豫地矿青科创[2020]8号)。

摘　　要：农用化学肥料提供作物生长所需营养元素,不能被吸收的组分滞留在土壤中,对周围地表水和地下水水质构成潜在影响.农用化肥中元素含量以及稳定同位素组成常用来衡量和计算其对地表水和地下水硝酸盐和硫酸盐污染的贡献.但农用化肥种类繁多,其水溶性离子浓度及同位素组成尚不清楚.在收集河南省内部分市售农用化肥基础上,通过分析水溶态化肥(1 g农用化肥溶解于1 L纯水)离子浓度及溶解性硫酸盐(SO_(4)^(2-))硫和氧同位素(δ^(34)S和δ^(18)O)及固体化肥中总氮(TN)含量和氮同位素(δ^(15)N),说明农用化肥元素和同位素组成特征.结果表明,化肥溶液pH值范围3.6~10.2,均值为6.7±1.5 (n=30,1σ),溶解态SO_(4)^(2-)和硝酸盐(NO^(-)_(3))浓度范围分别为4.38~827.29 mg·L^(-1)和1.34~208.90 mg·L^(-1),ρ(SO_(4)^(2-))和ρ(NO^(-)_(3))中位值分别为192.80 mg·L^(-1)和13.51 mg·L^(-1),均值分别为(256.19±239.93)mg·L^(-1)(n=30)和(37.07±53.21)mg·L^(-1)(n=29),铵盐(NH^(+)_(4))浓度范围为1.12~701.83 mg·L^(-1),ρ(NH^(+)_(4))中位值为277.05 mg·L^(-1),均值为(282.55±226.44)mg·L^(-1)(n=30);化肥溶解态SO_(4)^(2-)的δ^(34)S和δ^(18)O值范围分别为-3.5‰~19.0‰和6.7‰~18.5‰,中位值分别为4.1‰和10.1‰,均值分别为(5.8±5.5)‰(n=22,1σ)和(10.7±2.7)‰(n=22,1σ);化肥TN含量和δ^(15)N值范围分别为0.5%~38.9%和-2.7‰~3.4‰,中位值分别为13.3%和0.0‰,均值分别为(14.8±9.3)%(n=25)和(0.0±1.5)‰(n=24,1σ);化肥中溶解态SO_(4)^(2-)具有较低δ^(34)S均值和较高δ^(18)O均值,可能与化肥生产过程中使用硫酸作为原料有关,造成化肥溶液pH与溶解态SO_(4)^(2-)浓度呈负相关关系(P<0.05);化肥TN的δ^(15)N值靠近大气N_(2)的δ^(15)N组成,显示化肥原料中NO^(-)_(3)/NH^(+)_(4)多由N_(2)合成的特征.结果指出河南省境内施用的农用化肥中溶解态SO_(4)^(2-)、 NO^(-)_(3)和NH^(+)_(4)的浓度范围及其溶解态硫酸盐的δ^(34)S和δ^(1Agricultural fertilizers(AFs) have provided vegetation with necessary nutrients,but unabsorbed constituents have been retarded in soil,potentially affecting the quality of adjacent surface water and groundwater.AFs element contents and stable isotope compositions have often been utilized to assess and calculate AFs pollution to nitrate and sulfate in surface water and groundwater;however,due to various AFs applied,the dissolved ion concentrations and isotope ratios are still unknown.This study collected commercial AF widely utilized in Henan province,China,to constrain their ion concentrations and isotope values.The dissolved ions(1 g AFs dissolved in 1 L ultrapure water),sulfate sulfur,and oxygen isotope values(δ^(34)S and δ^(18)O) were analyzed,and total nitrogen(TN) contents coupled with nitrogen isotope values(δ^(15)N) in solid AFs were determined to elucidate their elemental and isotopic compositions.These characteristics provided a scientific basis for further assessing their contributions to surface water and groundwater contaminations.The results indicated that pH values in the AFs solutions varied from 3.6 to 10.2,with a mean value of 6.7±1.5(n=30,1σ).Sulfate(SO_(4)^(2-)) and nitrate(NO^(-)_(3)) concentrations ranged from 4.38 mg·L^(-1) to 827.29 mg·L^(-1) and from 1.34 mg·L^(-1) to 208.90 mg·L^(-1),with median values of 192.80 mg·L^(-1) and 13.51 mg·L^(-1) and average values of(256.19±239.83) mg·L^(-1)(n=30) and(37.07±53.21) mg·L^(-1)(n=29),respectively.Dissolved sulfate δ^(34)S and δ^(18)O values in AFs varied from-3.5‰ to 19.0‰ and from 6.7‰ to 18.5‰,with median values of 4.1‰ and 10.1‰ and mean values of(5.8±5.5)‰(n=22,1σ) and(10.7±2.7)‰(n=22,1σ),respectively.TN and δ^(15)N values in AFs ranged from 0.5% to 38.9% and from-2.7‰ to 3.4‰,with median values of 13.3% and 0.0‰ and average values of(14.8±9.3)%(n=25) and 0.0±1.5‰(n=24,1σ),respectively.The lower averaged δ^(34)S values and positive averaged δ^(18)O values potentially resulted from sulfuric ac

关 键 词：农用化肥 硫酸盐 硫和氧同位素 氮同位素 水体污染 

分 类 号：X592[环境科学与工程—环境工程]