CAJ | 학술논문

研究了用碱熔-离子色谱法测定土壤中全硫的方法,样品采用氧化镁—碳酸钠(2:1)混合熔剂,在恒温马弗炉中800℃加热1 h,使土壤中各种形态的硫转化为SO_4~(2-),冷却,用水超声浸提.离子色谱法测定.分析柱AS14A4-mm(4 mm×250mm),淋洗液0.008mol·L~(-1)Na_2CO_3、0.001 mol·L~(-1)INaHCO_3,再生液0.05mol·LH_2SO_4~(-1),流量1.0mL·min~(-1),进样体积20μL,外标峰面积定量.该方法测定土壤中硫检测限为0.8 mg·kg~(-1),在测量浓度范围内具有良好的线性关系.用该方法做精密度,相对标准偏差为3.91%.与不同地区的标准土做对比实验,所测结果跟标准值相比均在标准值范围内.实验证明该方法操作简便、快速.
연구료용감용-리자색보법측정토양중전류적방법,양품채용양화미—탄산납(2:1)혼합용제,재항온마불로중800℃가열1 h,사토양중각충형태적류전화위SO_4~(2-),냉각,용수초성침제.리자색보법측정.분석주AS14A4-mm(4 mm×250mm),림세액0.008mol·L~(-1)Na_2CO_3、0.001 mol·L~(-1)INaHCO_3,재생액0.05mol·LH_2SO_4~(-1),류량1.0mL·min~(-1),진양체적20μL,외표봉면적정량.해방법측정토양중류검측한위0.8 mg·kg~(-1),재측량농도범위내구유량호적선성관계.용해방법주정밀도,상대표준편차위3.91%.여불동지구적표준토주대비실험,소측결과근표준치상비균재표준치범위내.실험증명해방법조작간편、쾌속.
A determination method of total sulfur in soil by alkali fusion ion chromatography was investigated. Samples mixed with magnesium oxide and sodium carbonate (2 : 1) in a muffle furnace at 800 ℃ for 1 h, making all the sulfur present as sulfurate, added some water and extracted by the ultrasonic assistant extraction. The determination of sulfurate were achieved on AS14A 4-mm(4 mm×250 mm) column with eluent as 0.008 mol·L~(-1) Na_2CO_3/0.001 mol·L~(-1) NaHCO_3 and regenerant was0.05 mol·L~(-1)H_2SO_4. The determination was performed at a flow rate of 1.0 mL·min~(-1), the injection volume was 20 μL, and the use of area-external stan-dard method to measure their amount. The detection limit of this method was 0.8 mg·kg~(-1). The RSD was3.91% in the determination of precision .The data from the determination of standard soils from different district were all in the predict range. It is proved that this method is simple and fast.