The fractional factorial and Doehlert designs for optimization of a slurry sampling procedure to determine of nutrients in sugarcane juice by inductively coupled plasma optical emission spectrometry (ICP OES) were applied. External calibration curves were used for direct analysis of the slurry. This procedure allowed determination of Ca, Cu, Fe, K and Mg with limits of detection (LoD) obtained of 2.0, 0.04, 0.2, 1.0 and 1.5 mg L⁻¹, respectively. The precision was expressed as relative standard deviation (%RSD), being better than 1.4% (n = 3). Accuracy was confirmed by comparison with sample digestion method. The results for analysis of fourteen sugarcane juices samples demonstrated that the nutrients Ca, Cu, Fe, K and Mg have average contents of 108, 0.506, 6.40, 470 and 114 mg L⁻¹, respectively. The proposed analytical method is a good alternative for simultaneous determination of nutrients in sugarcane juice using introduction of slurries and detection by ICP OES.

应用了分数阶乘和Doehlert设计来优化浆液采样程序，以通过电感耦合等离子体发射光谱法（ICP OES）确定甘蔗汁中的营养成分。外部校准曲线用于直接分析浆液。该程序允许测定Ca，Cu，Fe，K和Mg，其检出限（LoD）分别为2.0、0.04、0.2、1.0和1.5 mg L ^-1。精度表示为相对标准偏差（％RSD），优于1.4％（n = 3）。通过与样品消解方法进行比较来确认准确性。14个甘蔗汁样品的分析结果表明，营养元素Ca，Cu，Fe，K和Mg的平均含量分别为108、0.506、6.40、470和114 mg L ^-1， 分别。所提出的分析方法是通过引入浆料并通过ICP OES检测同时测定甘蔗汁中营养成分的良好替代方法。