以泰花8号为试验材料,分别设置JM1(0.01 mm强化耐厚膜)、JM2(0.01 mm PPC膜)、JM3(0.01 mm PLA膜)、JM4(0.008 mm PLA膜)、JM5(0.006 mm PLA膜)、JM6(0.01 mm PBAT膜)和CK1(普通白膜)、CK2(普通黑膜)、CK3(露地栽培)处理,研究生物降解...以泰花8号为试验材料,分别设置JM1(0.01 mm强化耐厚膜)、JM2(0.01 mm PPC膜)、JM3(0.01 mm PLA膜)、JM4(0.008 mm PLA膜)、JM5(0.006 mm PLA膜)、JM6(0.01 mm PBAT膜)和CK1(普通白膜)、CK2(普通黑膜)、CK3(露地栽培)处理,研究生物降解膜对花生产量以及收获后田间土壤污染的影响。结果表明:花生收获前,JM2、JM4、JM5和JM6膜型自然降解均达4级(70%)以上,而JM1、CK1和CK2在土壤中仍保持完好。CK1、CK2、JM1对花生生育促进和增产效果均最好,JM3和JM2稍次。通过对JM2、JM3、JM6和CK3土壤样品进行全元素检测和热裂解分析,检测结果中重金属元素均处于安全范围内,且JM2、JM3、JM6土壤样品中主要成分均为CO2。展开更多
A survey was carried out with the aim of assessing the level of the total phenolic compounds （TPC）, essential （Na, K, Ca, Mg, Cu, Zn） and toxic （Cd and Pb） elements in 10 Latvian whole grain rye and/or wheat flo...A survey was carried out with the aim of assessing the level of the total phenolic compounds （TPC）, essential （Na, K, Ca, Mg, Cu, Zn） and toxic （Cd and Pb） elements in 10 Latvian whole grain rye and/or wheat flour bread samples, obtained from the local market. The quantities of the TPC were determined by spectrophotometry. Mineral content was determined by flame photometry, flame atom absorption spectrometry （FAAS） and electrothermal atomic absorption spectrometry （ETAA） after wet digestion in concentrated HNO3. The values were comparable to the literature data. The average content in all the samples was （on a basis of weight of the product） 547 ± 28 mg/100 g for Na; 280 ±20 mg/100 g for K; 32 ± 2 mg/100 g for Ca; 88 ±5 mg/100 g for Mg; 0.49 ± 0.09 mg/100 g for Cu; 1.6 ±0.2 mg/100 g for Zn. Both Pb and Cd were determined below the limit of detection （LOD 5 0.10 mg/100 g）. The LOD values were determined for each element. The TPC content in defatted samples was slightly lower than the non-defatted ones, showing the dependence on the sample preparation. The calculated average levels of the elements were compared with the maximum levels recommended or regulated by the national legislation.展开更多
文摘以泰花8号为试验材料,分别设置JM1(0.01 mm强化耐厚膜)、JM2(0.01 mm PPC膜)、JM3(0.01 mm PLA膜)、JM4(0.008 mm PLA膜)、JM5(0.006 mm PLA膜)、JM6(0.01 mm PBAT膜)和CK1(普通白膜)、CK2(普通黑膜)、CK3(露地栽培)处理,研究生物降解膜对花生产量以及收获后田间土壤污染的影响。结果表明:花生收获前,JM2、JM4、JM5和JM6膜型自然降解均达4级(70%)以上,而JM1、CK1和CK2在土壤中仍保持完好。CK1、CK2、JM1对花生生育促进和增产效果均最好,JM3和JM2稍次。通过对JM2、JM3、JM6和CK3土壤样品进行全元素检测和热裂解分析,检测结果中重金属元素均处于安全范围内,且JM2、JM3、JM6土壤样品中主要成分均为CO2。
文摘A survey was carried out with the aim of assessing the level of the total phenolic compounds （TPC）, essential （Na, K, Ca, Mg, Cu, Zn） and toxic （Cd and Pb） elements in 10 Latvian whole grain rye and/or wheat flour bread samples, obtained from the local market. The quantities of the TPC were determined by spectrophotometry. Mineral content was determined by flame photometry, flame atom absorption spectrometry （FAAS） and electrothermal atomic absorption spectrometry （ETAA） after wet digestion in concentrated HNO3. The values were comparable to the literature data. The average content in all the samples was （on a basis of weight of the product） 547 ± 28 mg/100 g for Na; 280 ±20 mg/100 g for K; 32 ± 2 mg/100 g for Ca; 88 ±5 mg/100 g for Mg; 0.49 ± 0.09 mg/100 g for Cu; 1.6 ±0.2 mg/100 g for Zn. Both Pb and Cd were determined below the limit of detection （LOD 5 0.10 mg/100 g）. The LOD values were determined for each element. The TPC content in defatted samples was slightly lower than the non-defatted ones, showing the dependence on the sample preparation. The calculated average levels of the elements were compared with the maximum levels recommended or regulated by the national legislation.
